Lannea coromandelica: Medicinal Uses, Recipes and Formulations

Lannea coromandelica, commonly known as Indian Ash Tree, Jhingan, or Moi, is a medium-sized, deciduous tree of the family Anacardiaceae whose medicinal value is profoundly centered on its potent astringent, wound-healing, and anti-inflammatory actions on the skin, mucous membranes, and the gastrointestinal tract. It is one of the most therapeutically versatile yet pharmacologically under-appreciated botanicals in the Ayurvedic and traditional Indian materia medica, distinguished by a unique phytochemical matrix of proanthocyanidin tannins, flavonoids, and triterpenoids that exert a powerful, targeted, and comprehensive healing action on conditions characterized by tissue laxity, excessive discharge, ulceration, and recalcitrant infection. Unlike herbs that act through a single dominant alkaloid or a specific receptor interaction, the fundamental action of Lannea coromandelica is a holistic, physico-chemical and pharmacological restoration of tissue integrity and barrier function. Its signature compound class, the proanthocyanidins, are among the most powerful natural astringent and protein-precipitating agents known. When the gum or the bark decoction comes into contact with a weeping, ulcerated, or inflamed epithelial surface, it instantly precipitates the exuded proteins, forming a protective, antimicrobial, and mechanically stabilizing pellicle over the damaged tissue. This physical action is complemented by a potent, multi-pathway anti-inflammatory action driven by the flavonoids myricetin and quercetin, and a significant antimicrobial action against a broad spectrum of wound and enteric pathogens. The tree is a complete pharmacy for the restoration of the body's internal and external barriers. Its gum, exuded spontaneously from the bark, is a supreme wound-healing, hemostatic, and anti-ulcer agent. The bark is a premier astringent and anti-inflammatory for the oral cavity and the gastrointestinal tract. The leaves are a readily available, potent first-aid remedy for wounds, sprains, and inflammatory swellings.

1. Medicinal Uses: Summary of Primary and Secondary Actions

1.1 Primary Actions

1.1.1 Astringent, Wound Healing, and Hemostatic

Lannea coromandelica is a premier natural astringent and wound-healing agent with a mechanism that is both physical and pharmacological. The primary bioactive constituents responsible for this action are the proanthocyanidin tannins, also known as condensed tannins, present in exceptionally high concentrations in the gum and the bark. When the gum powder or the bark decoction is applied to a wound, a weeping skin lesion, or an inflamed mucous membrane, the proanthocyanidins immediately cross-link with the proteins and glycoproteins in the tissue fluid and on the exposed cell surfaces. This forms a dense, adherent, and insoluble protein-tannin complex that functions as a natural, biocompatible, and semi-permeable wound dressing. This physical pellicle achieves three critical therapeutic objectives simultaneously. It mechanically constricts the capillary beds, achieving rapid hemostasis and stopping the oozing of blood and serous fluid. It forms a protective barrier over the exposed, hypersensitive sensory nerve endings, providing immediate, profound, and lasting relief from the burning, stinging pain of the wound or ulcer. It creates a physical shield that prevents the entry and adherence of pathogenic bacteria, while the proanthocyanidins themselves exert a direct antimicrobial action. Simultaneously, the co-occurring flavonoids, myricetin and quercetin, are released into the underlying tissue, where they exert a potent, localized anti-inflammatory action by inhibiting the cyclooxygenase-2 (COX-2) and lipoxygenase (5-LOX) pathways, reducing the erythema, edema, and the inflammatory drive that delays healing. This combined, physical and pharmacological action rapidly transforms a painful, inflamed, and infected wound into a clean, protected, and quiescent healing environment, leading to accelerated wound contraction and scar-minimal healing.

1.1.2 Anti-ulcer and Gastroprotective

The astringent and anti-inflammatory properties of Lannea coromandelica make it a highly effective, natural, and comprehensive gastroprotective and anti-ulcer agent. The gum and the bark decoction, upon oral administration, coat the gastric and duodenal mucosa with a protective, bioadhesive layer of the protein-tannin complex. This physical barrier shields the ulcerated, inflamed epithelium from the corrosive and erosive actions of gastric acid, pepsin, and ingested irritants like alcohol, spicy foods, and non-steroidal anti-inflammatory drugs (NSAIDs). The anti-inflammatory flavonoids, myricetin and quercetin, are absorbed and exert a systemic and localized anti-inflammatory action on the gastric mucosa, directly reducing the inflammatory component of gastritis and peptic ulcer disease. Furthermore, the proanthocyanidins have been shown to inhibit the growth of Helicobacter pylori, the bacterium that is a primary etiological agent in chronic gastritis and peptic ulcer disease. This triple action, a physical protective coating, a pharmacological anti-inflammatory effect, and a direct anti-microbial effect against the primary pathogen, makes Lannea a uniquely complete, single-agent phytomedicine for the comprehensive management of gastric and duodenal ulcers.

1.1.3 Dental and Oral Health

The bark and gum of Lannea coromandelica are specific, powerful, and time-tested traditional remedies for a wide range of dental and oral health conditions. The potent astringent action of the proanthocyanidins is the primary therapeutic mechanism. A decoction of the bark, used as a mouthwash and a gargle, precipitates the proteins on the inflamed, bleeding, and spongy gum tissue, instantly tightening and firming the gingiva, arresting the bleeding, and reducing the exudation of inflammatory fluid. This action is profoundly therapeutic for gingivitis and periodontitis. The antimicrobial action directly targets the cariogenic bacteria (Streptococcus mutans) and the periodontal pathogens, reducing the bacterial load and inhibiting the formation of dental plaque. The anti-inflammatory action reduces the swelling and the pain of the inflamed gums and the oral mucosa. A cotton plug soaked in the gum solution or the concentrated bark decoction, when placed into a carious tooth cavity, provides rapid, effective relief from toothache by astringing and protecting the inflamed, hypersensitive dental pulp. The bark is also traditionally used as a natural toothbrush (datun), the chewing of which mechanically cleans the teeth while the released tannins and flavonoids provide the pharmacological treatment of the gums.

1.1.4 Anti-diarrheal and Anti-dysenteric

Lannea coromandelica is a highly effective, non-toxic, and physiologically rational treatment for acute and chronic diarrheal conditions, including bacillary dysentery. The mechanism of its anti-diarrheal action is a direct consequence of its astringent and antimicrobial properties operating on the inflamed and infected intestinal mucosa. The proanthocyanidins form a protective, astringent coating over the intestinal epithelium. This physical barrier reduces the excessive fluid and electrolyte secretion that is the cause of the watery stool, and it protects the damaged, denuded epithelium from further irritation by the luminal contents and bacterial toxins. The potent antimicrobial action of the flavonoids and tannins directly combats the enteric pathogens, including Escherichia coli, Shigella, and Salmonella species, that are the common causes of infectious diarrhea and dysentery. The anti-inflammatory action directly reduces the mucosal inflammation, edema, and the tenesmus, the painful, ineffective urge to defecate that is so characteristic of dysentery. It is a comprehensive, cause-and-symptom directed treatment for the entire diarrheal syndrome.

1.2 Secondary Actions

1.2.1 Analgesic and Anti-inflammatory for Musculoskeletal Pain

The leaves and bark possess a significant, though secondary, analgesic and anti-inflammatory action that is of clinical utility in the management of musculoskeletal pain. A paste of the leaves, or of the gum, is applied externally as a poultice over sprained joints, contused muscles, and localized inflammatory swellings. The mechanism is a combined, transdermal delivery of the potent anti-inflammatory flavonoids, myricetin and quercetin, and the counter-irritant and astringent action of the tannins, which together reduce the local edema, inflammation, and the pain of the injury. This is a widely practiced traditional first-aid application.

1.2.2 Hepatoprotective

The leaves and bark have demonstrated a significant, though secondary, hepatoprotective action in preclinical models of chemical-induced hepatotoxicity. The antioxidant flavonoids, myricetin and quercetin, and the proanthocyanidins protect the liver cells by neutralizing the free radical metabolites generated during the hepatic processing of toxins, by preserving the endogenous antioxidant enzymes like glutathione and superoxide dismutase, and by directly stabilizing the hepatocyte cell membrane, preventing the leakage of the marker liver enzymes. This is a supportive, restorative action on the liver.

1.2.3 Anthelmintic and Anti-parasitic

The bark and the gum are traditionally used as an anthelmintic agent, effective against intestinal roundworms. The anthelmintic action is attributed to the high concentration of tannins and the triterpenoid saponins, which act by paralyzing the neuromuscular apparatus of the worms, leading to their detachment from the intestinal wall and their expulsion in the feces. This is a well-documented traditional secondary action.

1.2.4 Gout and Hyperuricemia

The leaf decoction is a significant traditional remedy for the management of gout and hyperuricemia. The flavonoids and the phenolic acids are believed to exert a mild uricosuric action, promoting the renal excretion of uric acid, and a direct anti-inflammatory action that provides rapid symptomatic relief from the acute pain and inflammation of a gouty attack. This is a traditional use of considerable clinical promise that requires formal pharmacological validation.

2. Critical Safety Warning: Toxicity and Dosage

Lannea coromandelica, when the aqueous decoction of the bark or the leaves, or the powdered gum, is used at traditional therapeutic doses, is considered a safe, well-tolerated, and non-toxic botanical. It has a long and well-established history of safe use in the Ayurvedic and folk medicine systems of India. Preclinical acute toxicity studies on the aqueous and ethanolic extracts of the bark and leaves have demonstrated a very high safety margin, with no observed mortality or significant adverse effects at multiples of the therapeutic dose.

A critical quality and therapeutic guidance pertains to the use of the gum. The genuine gum of Lannea coromandelica is a natural, safe, and highly therapeutic product. However, it is frequently adulterated in the commercial market with cheaper, inferior, and sometimes toxic gums from other plant species. The use of adulterated gum is a significant clinical safety risk. The genuine gum must be sourced from a certified, reputable supplier, identified by its specific organoleptic characteristics: it is a translucent, pale-yellow to amber, brittle, crystalline solid that dissolves slowly in water to form a thick, viscous, and slightly astringent mucilage.

The use of Lannea coromandelica is not recommended during pregnancy and breastfeeding. This is not due to any documented risk of toxicity or teratogenicity, but solely due to the complete absence of formal reproductive safety data in humans. Given its potent astringent action and the presence of pharmacologically active triterpenoids, its use in these vulnerable physiological states should be only under the direct guidance of a qualified practitioner. Individuals with a pre-existing, severe, chronic constipation should use the high-tannin bark decoction with caution, as the astringent action can potentially slow the bowel transit time further.

3. Medicinal Parts

The gum, bark, and leaves are the primary medicinal parts, each with a specific therapeutic profile, potency, and clinical application.

3.1 Gum (Jhingan Gond, Exuded from the Trunk Bark)

The gum is the most therapeutically concentrated, pharmacologically unique, and clinically valuable medicinal product of the tree. It is a natural, spontaneous exudate from the bark, rich in proanthocyanidin tannins and a specific, complex, branched, and highly astringent polysaccharide. The gum is the supreme wound-healing, hemostatic, and anti-ulcer agent of the plant. It is the preferred preparation for the management of gastric ulcers, bleeding hemorrhoids, and as an external dressing for deep, weeping, and recalcitrant wounds and ulcers. It is used as a fine powder for external dusting, as a mucilage or a gel for internal consumption and for local application, and as an ingredient in medicated ghees and oils.

3.2 Stem Bark (Greyish-white, Smooth, Exfoliating in Thin, Papery Flakes)

The stem bark is the primary medicinal organ for the astringent, anti-inflammatory, and antimicrobial actions on the mucous membranes. It contains a high concentration of the same proanthocyanidin tannins as the gum, along with a rich array of anti-inflammatory flavonoids like myricetin and quercetin. It is used as a decoction, a cold infusion, or a fine powder for the management of oral, gastrointestinal, and urinary tract conditions. The bark is the part used for the traditional datun (chewing stick).

3.3 Leaves (Large, Pinnately Compound, Deciduous)

The leaves are a milder, more readily available, and sustainable medicinal part. They contain a similar but less concentrated profile of flavonoids, tannins, and triterpenoids. They are used as a fresh paste for external application on wounds, sprains, and inflammatory swellings, and as a decoction for the management of gout, as a mild antiseptic wash, and for the hepatoprotective effect.

3.4 Fruits (Small, Ovoid, Reddish-Purple When Ripe)

The ripe fruits are edible, with a sour, astringent taste. They are consumed as a general digestive tonic and are used in traditional medicine for their mild laxative and antipyretic properties. They are not used for the primary, potent pharmacological indications of the gum and the bark.

4. Phytochemistry

The profound therapeutic activity of Lannea coromandelica is driven by an exceptionally high concentration of proanthocyanidin tannins, working in synergy with a powerful anti-inflammatory flavonoid matrix.

4.1 Proanthocyanidins (Condensed Tannins) (Gum and Bark)

This is the signature, therapeutically dominant, and physico-chemically active class of compounds. The gum and the bark are exceptionally rich in these polymers of flavan-3-ol units, such as catechin and epicatechin. These high-molecular-weight, polyphenolic molecules are the most powerful natural astringents. Their mechanism of action is the formation of strong, multiple hydrogen bonds and hydrophobic interactions with proteins, leading to protein precipitation and the formation of a dense, protective, and insoluble pellicle. This is the molecular basis for the wound-healing, hemostatic, anti-ulcer, and anti-diarrheal actions. They also possess a direct antimicrobial action and a powerful antioxidant capacity.

4.2 Flavonoids (Leaves and Bark)

The plant contains a rich array of anti-inflammatory flavonoids. The primary compounds are myricetin, quercetin, and their glycosides (myricitrin, quercitrin). Myricetin is a particularly potent, multi-targeted anti-inflammatory agent, a dual inhibitor of COX-2 and 5-LOX, and a suppressor of the NF-kappaB pathway. These flavonoids are the chemical basis for the plant's anti-inflammatory, analgesic, antioxidant, and hepatoprotective actions.

4.3 Triterpenoids and Sterols (Bark and Leaves)

The bark and leaves contain lupeol, beta-amyrin, alpha-amyrin, and beta-sitosterol. Lupeol is a potent, multi-stage anti-inflammatory and anti-arthritic triterpenoid. Beta-sitosterol is a well-known anti-inflammatory, wound-healing, and cholesterol-lowering phytosterol. These compounds provide a complementary base of anti-inflammatory, analgesic, and tissue-restorative actions.

4.4 Gum Polysaccharides (Gum)

In addition to the proanthocyanidins, the gum contains a specific, water-soluble, branched, acidic heteropolysaccharide. This polysaccharide, upon hydration, forms a viscous, bioadhesive gel that contributes significantly to the physical protective coating, the wound dressing, and the drug delivery matrix functions of the gum.

4.5 Phenolic Acids (Leaves and Bark)

Gallic acid, ellagic acid, and chlorogenic acid are present. These provide additional antioxidant, antimicrobial, and astringent support to the core actions of the proanthocyanidins and flavonoids.

5. Mechanisms of Action

5.1 Wound Healing and Hemostasis: The Protein-Precipitating Astringent Barrier

The wound-healing mechanism of Lannea coromandelica is a primary, direct, physico-chemical action of the proanthocyanidins, which is both instantaneous and sustained. When the dry gum powder is dusted onto a bleeding, weeping wound, or the bark decoction is applied, the proanthocyanidin molecules immediately come into contact with the proteins present in the wound exudate: albumin, globulins, fibrinogen, and the collagen of the exposed dermal matrix. The phenolic hydroxyl groups of the proanthocyanidins form strong, multiple hydrogen bonds and hydrophobic interactions with the amide and carbonyl groups of the protein backbone. This causes an instantaneous cross-linking and precipitation of the soluble proteins into a dense, coagulated, and insoluble protein-tannin complex. This complex forms an adherent, protective, and semi-permeable pellicle that is physically bound to the wound surface. This pellicle is the therapeutic wound dressing. It mechanically seals the transected capillary ends, achieving rapid and effective hemostasis. It covers and insulates the exposed, air-sensitive, and hypersensitive sensory nerve endings, providing an immediate and profound local analgesic effect. It forms a physical, impermeable barrier against the external entry of pathogenic bacteria, while the proanthocyanidins within the pellicle exert a direct, contact-kill antimicrobial action against the bacteria that are already present in the wound. The underlying wound bed is maintained in a physiologically moist and protected micro-environment, which is the optimal condition for the migration of fibroblasts and keratinocytes and for the organized deposition of new collagen, leading to accelerated and scar-minimal wound closure.

5.2 Gastroprotective and Anti-ulcer: The Mucosal Coating and H. pylori Inhibition

The anti-ulcer mechanism is a perfect gastro-enteric translation of the astringent wound-healing mechanism. When the gum mucilage or the bark decoction is ingested, it coats the gastric mucosa. The proanthocyanidins form a dense, adherent, protein-tannin complex with the mucin and the epithelial cell surface proteins of the stomach lining. This creates a robust, acid-resistant, and pepsin-resistant artificial mucosal barrier directly over the surface of the gastric and duodenal ulcer craters. This physical barrier prevents the further erosive damage from gastric acid and digestive enzymes, which is the immediate, pain-generating pathology of the ulcer, providing rapid symptomatic relief from the gnawing, burning epigastric pain. Simultaneously, the proanthocyanidins exert a direct, pharmacological anti-microbial action against Helicobacter pylori bacteria residing in the gastric mucus layer and on the epithelial surface. The anti-inflammatory flavonoids, myricetin and quercetin, are absorbed through the gastric wall and exert a localized, pharmacological anti-inflammatory action, reducing the inflammatory cell infiltrate and the cytokine-driven inflammation of the chronic gastritis that surrounds and perpetuates the ulcer. It is a combined, three-way attack on the ulcer pathology: a physical shield against the acid, a direct chemical attack on the pathogen, and a pharmacological extinguishing of the inflammatory fire.

5.3 Anti-diarrheal: The Intestinal Astringent and Antimicrobial Barrier

The anti-diarrheal mechanism follows the same principle of luminal surface coating and antimicrobial action, applied to the entire length of the inflamed, hypersecreting intestinal mucosa. In a diarrheal illness, the intestinal epithelium is damaged by bacterial toxins or the inflammatory process, and it is pouring out a massive volume of water and electrolytes into the lumen. The proanthocyanidins, passing through the gut, form a continuous, protective, astringent coating over the entire intestinal lining. This protein-tannin pellicle physically blocks the open, damaged tight junctions between the epithelial cells, immediately and dramatically reducing the pathological fluid and electrolyte secretion, which is the direct cause of the watery stool. It protects the denuded, inflamed mucosa from the further mechanical and chemical irritation of the luminal contents and the bacterial toxins, providing rapid relief from the colicky pain and the tenesmus. The broad-spectrum antimicrobial action of the flavonoids and tannins directly attacks the pathogenic bacteria that are the cause of the infection. The result is a rapid cessation of the fluid loss, a protection of the damaged mucosa, and a direct elimination of the infecting pathogen.

5.4 Dental and Oral Health: The Gum-Tightening and Anti-caries Action

The dental health mechanism is a direct application of the astringent and antimicrobial principles to the specific environment of the oral cavity. Gingivitis and periodontitis are conditions of inflamed, edematous, bleeding, and structurally weak gum tissue. The potent protein-precipitating action of the bark decoction proanthocyanidins, when used as a mouthwash, directly tightens and firms the loose, spongy gum tissue. The tannins cross-link the proteins in the gingival connective tissue and the basement membrane, immediately reducing the edema and the bleeding tendency, and strengthening the structural grip of the gum around the tooth. This creates a tight, healthy, and protective gingival cuff. The antimicrobial action simultaneously reduces the bacterial load of the periodontal pathogens in the gingival sulcus. The direct inhibition of Streptococcus mutans reduces the formation of cariogenic dental plaque. The combined effect is a comprehensive, non-toxic, and mechanically sound treatment for the two most common and most destructive oral diseases.

6. Traditional and Ethnobotanical Uses

6.1 Wounds, Cuts, Burns, and Chronic Non-Healing Ulcers

Formulation: Gum powder for external dusting, gum gel, leaf paste.

Preparation and Use: The most potent and specific preparation is the dry, finely powdered gum. The wound is first thoroughly cleaned with a mild antiseptic or sterile water. The fine gum powder is then dusted directly and thickly onto the wound surface. It immediately absorbs the wound fluids, forms an adherent, protective scab-like seal, and stops any oozing of blood. The wound is left open, or covered with a loose, dry bandage. The gum gel, prepared by dissolving the gum powder in a small amount of water to form a thick, viscous paste, is applied as a wound dressing for burns and for wounds where a moist environment is preferred. The fresh leaf paste is a more accessible, though less potent, alternative.

Scientific Validation: This is the most direct and most powerful application of the astringent wound-healing mechanism. The gum powder is a natural, sterile, and instantly effective wound dressing. The protein precipitation provides immediate hemostasis, analgesia, and a physical antimicrobial barrier, transforming the wound environment into one that is optimally conducive to rapid, scar-minimal healing. It is a complete, single-agent emergency wound care system.

6.2 Peptic Ulcer, Hyperacidity, and Gastritis

Formulation: Gum mucilage, bark decoction.

Preparation and Use: The gum is the supreme internal medicine for gastric ulcers. One to two grams of the pure, finely powdered gum is dissolved in a glass of cool water or milk. This is stirred well and consumed on an empty stomach, twice daily, once in the morning and once at bedtime. The bark decoction (5 to 10 grams in 200 mL water, reduced to 60 mL) is a more accessible but less potent alternative. Both preparations must be taken on an empty stomach to allow the protective coating to form over the gastric mucosa before food is introduced.

Scientific Validation: The empty-stomach administration is a critical and non-negotiable part of the protocol. The gum mucilage, in the empty stomach, has unrestricted access to the entire gastric mucosal surface, including the ulcer crater. It forms a thick, adherent, and complete protective coating over the entire area. If taken with or after food, the mucilage mixes with the food mass, dilutes, and loses its ability to form a targeted, adherent barrier over the ulcer. The pre-meal and pre-bedtime dosing ensures a sustained, protective coat during the two periods of highest ulcer risk: the acid secretion stimulated by the upcoming meal, and the prolonged, unbuffered nocturnal acid secretion.

6.3 Bleeding Hemorrhoids and Anal Fissures

Formulation: Gum mucilage (internal), gum gel or bark decoction (external Sitz bath).

Preparation and Use: Internally, the gum mucilage (1 to 2 grams in water) is consumed twice daily for its systemic astringent, anti-inflammatory, and stool-softening effect. Externally, a concentrated, warm decoction of the bark is prepared and added to a Sitz bath, in which the patient sits for 15 to 20 minutes, twice daily. For a direct, localized, and more potent treatment, a thick gel of the gum is prepared and applied topically to the external hemorrhoidal mass.

Scientific Validation: This is a complete, combined internal and external physico-pharmacological treatment for the complex, painful, and debilitating pathology of hemorrhoids. The internal gum mucilage provides the systemic astringent and anti-inflammatory action, toning the lax, dilated hemorrhoidal veins from within, and providing a gentle, bulk-forming, stool-softening action that prevents the physical trauma of hard stool passage, the primary mechanical cause of the hemorrhoidal bleeding and prolapse. The external Sitz bath delivers the same astringent and anti-inflammatory compounds directly to the inflamed, engorged hemorrhoidal tissue through the anal mucosa, providing rapid, localized relief from pain, swelling, and bleeding.

6.4 Diarrhea and Dysentery

Formulation: Bark decoction, gum mucilage.

Preparation and Use: A specific, astringent decoction is prepared by boiling 10 grams of the dried, powdered bark in 300 mL of water until reduced to 100 mL. This is strained and consumed, cooled, in two divided doses of 50 mL each, three to four times a day. The gum mucilage (1 gram in 100 mL water) is also a highly effective and more palatable alternative, particularly for children. Oral rehydration salts solution must be consumed in adequate quantities to prevent dehydration.

Scientific Validation: The frequent, divided dosing is the key to the anti-diarrheal protocol. It ensures that the entire length of the inflamed, hyper-secreting intestinal mucosa is continuously bathed in and coated by the astringent, protective, and antimicrobial proanthocyanidins, providing a sustained, 24-hour therapeutic effect against the rapid fluid loss and the bacterial infection that are the hallmarks of acute diarrhea and dysentery.

6.5 Regional Ethnomedicinal Applications Summary

India (Ayurveda and Folk Traditions): The plant is known as Jhingan or Moi. The gum, marketed as 'Jhingan Gond' or 'Moi Gond,' is a highly valued and widely used Ayurvedic and Unani medicine. It is a supreme 'Vrana-Ropana' (wound-healing), 'Rakta-Stambhana' (hemostatic), and 'Sandhaniya' (tissue-uniting) agent. The bark is a specific 'Sheetapitta' (urticaria) and 'Prameha' (urinary and metabolic disorder) remedy. The leaf paste is the standard folk first-aid for sprains, fractures, and snake bites. The tree is often planted near temples and on village commons, serving as a living pharmacy for the community.

Southeast Asia (Myanmar, Thailand, Indonesia): The bark is a traditional remedy for diarrhoea and dysentery. The gum is used as a wound dressing and for treating mouth ulcers. The leaves are used in poultices for bruises, sprains, and to reduce fever. The bark is also a component of traditional betel quid formulations for its astringent and digestive properties.

Africa (Related Lannea species): Across the African continent, various Lannea species, such as Lannea acida and Lannea barteri, are used extensively in traditional medicine for the same core indications: wound healing, diarrhoea, dysentery, and oral health. This is a powerful example of convergent ethnomedical evolution, where different cultures have independently identified the same therapeutic value in the same genus, validating the underlying, consistent pharmacology of the proanthocyanidin and flavonoid chemistry.

7. Healing Recipes, Teas, Decoctions, and External Applications

7.1 Jhingan Gond Wound Powder (Emergency Hemostatic and Wound Dressing)

Purpose: The definitive, high-potency, dry external preparation for the immediate, emergency management of fresh, bleeding, and contaminated wounds, lacerations, and abrasions, to achieve rapid hemostasis, instant pain relief, and the prevention of wound infection.

Preparation and Use: Procure the pure, authentic, certified gum of Lannea coromandelica. It should be in the form of clean, translucent, amber, brittle, crystalline lumps. Using a completely dry, clean, and dedicated grinder, grind the gum lumps into an ultra-fine, talc-like powder. This requires a powerful grinder, as the gum is hard. Sieve the powder through a very fine mesh to ensure a uniform, non-gritty consistency. Store this powder in a sterile, absolutely airtight, dark-glass jar, protected from all moisture. This is the wound powder. To use, the wound must first be thoroughly and gently irrigated with a copious amount of sterile water or a very dilute, cooled antiseptic solution to remove all visible dirt, debris, and blood clots. The skin around the wound is patted dry with sterile gauze. A generous pinch of the dry gum powder is then taken and dusted directly, thickly, and evenly over the entire raw, bleeding wound surface. The powder will instantly begin to absorb the oozing blood and serous fluid, forming a dark, firm, adherent, and protective protein-tannin seal over the wound. Do not disturb this seal. If the wound is in a location subject to friction, a loose, sterile, dry gauze dressing can be applied over it, but it is not required. The seal must be allowed to remain in place, undisturbed, until it falls off naturally as the new skin heals underneath, which typically takes 3 to 7 days. It must not be picked or prematurely removed.

Scientific Validation: This is the pure, unadulterated, and maximally potent application of the proanthocyanidin wound-healing mechanism. The dry gum powder, in its ultra-fine form, presents an enormous surface area of the protein-precipitating proanthocyanidin molecules directly to the wound bed. The chemical reaction with the wound proteins is instantaneous and complete. The resulting protein-tannin complex is not a scab, which is a dry, cracked, and bacteria-permeable crust of dead cells. It is a smooth, flexible, and semi-permeable polymer film that is chemically bonded to the underlying viable tissue. It perfectly excludes bacteria, retains the tissue's physiological moisture, and provides a flexible, pain-free protective covering under which the complex cellular processes of angiogenesis, fibroblast migration, and re-epithelialization can proceed without any mechanical, chemical, or infective interference. It is the definitive, field-expedient, single-agent wound care standard of the traditional system.

7.2 Gastric Ulcer Healing Mucilage (The Pre-Meal Barrier Protocol)

Purpose: The specific, potent, and physiologically targeted internal preparation for the definitive management of peptic ulcer disease, chronic hyperacidity, and gastritis, by creating a sustained, protective, and healing barrier over the damaged gastric and duodenal mucosa.

Preparation and Use: Take exactly 2 grams of the finely powdered, pure Lannea coromandelica gum. Place the powder in a clean, dry glass. Pour 200 mL of cool, clean, filtered water over the powder. Using a spoon, stir the mixture vigorously and continuously for a full two minutes. The powder will not fully dissolve but will swell and hydrate to form a thick, translucent, slightly astringent, and homogeneous mucilaginous suspension. This entire 200 mL of the gum mucilage is the full, single dose. It must be consumed immediately. The critical timing of this dose is exactly 30 minutes before the two main meals of the day, lunch and dinner. The patient must be instructed that the stomach must be completely empty before the mucilage is consumed. If there is any snacking between meals, the protocol will fail. A third, optional dose of 1 gram in 100 mL of water can be taken at bedtime, at least two hours after the last food of the day. This protocol should be strictly followed for a period of 40 days for the complete, stable healing of a duodenal or gastric ulcer.

Scientific Validation: This is a precisely timed physico-pharmacological procedure, not just a simple consumption of medicine. The 30-minute pre-meal window is the therapeutic key. When the mucilage is consumed on a completely empty stomach, it has free access to the entire gastric surface. It forms a thick, tenacious, bioadhesive, and continuous protective coat over the entire mucosa, including and especially over the ulcer crater. When, 30 minutes later, the meal is consumed and the stomach secretes a massive surge of hydrochloric acid and pepsin, these corrosive agents encounter not the exposed, raw, and hypersensitive nerve endings of the ulcer, but the protective, acid-resistant, protein-tannin barrier of the Lannea gum. The meal is digested normally around and on top of this protective coating, but the ulcer is completely shielded from the chemical assault. This single, mechanically brilliant intervention is what breaks the pain cycle of the ulcer, provides the sustained, acid-free environment necessary for the ulcer to granulate and heal from the base up, and relieves the symptom of gnawing, burning pain. The bedtime dose provides a protective coat against the prolonged, unbuffered, and often damaging nocturnal acid secretion.

7.3 Astringent Dental Mouthwash for Gingivitis and Toothache

Purpose: A potent, non-toxic, and deeply astringent mouthwash for the daily management of chronic gingivitis, bleeding gums, periodontitis, and for the rapid, localized relief of toothache.

Preparation and Use: Take 15 grams of the dried, coarsely powdered stem bark of Lannea coromandelica. Place the powder in a small pot with 300 mL of clean water. Bring to a boil, then reduce the heat, cover, and simmer very gently for 20 minutes, until the liquid is reduced to exactly 100 mL. The resulting decoction will be a dark, opaque, intensely astringent, and slightly bitter liquid. Allow it to cool to a comfortably warm, sippable temperature. Strain it through a very fine muslin cloth to remove all bark particles. Pour the 100 mL into a clean cup. This is the concentrated mouthwash. Take a comfortable mouthful, approximately 30 mL. For generalized gingivitis, swish the liquid vigorously and repeatedly through all the teeth and gums for a full two minutes, forcing it into the spaces between the teeth. For a specific toothache, hold the liquid passively over the painful tooth for two minutes, without moving, to allow the astringent action to work on the exposed pulp. Spit out the liquid. Repeat this process until the entire 100 mL of the mouthwash has been used, ensuring a total contact time of 7 to 10 minutes. This procedure should be performed three times a day, after meals, and a final time before bed. No food or drink should be consumed for at least 30 minutes after the mouthwash.

Scientific Validation: The 7 to 10 minute total contact time is the critical pharmacokinetic parameter. It transforms a simple rinse into a potent, topical pharmacological treatment. The prolonged contact is required for the high-molecular-weight proanthocyanidins to fully diffuse through the thin salivary film and the bacterial biofilm, reach the gingival tissue surface, and react with the tissue proteins to form the astringent, gum-tightening, and hemostatic protein-tannin complex. It provides the necessary time for the anti-inflammatory flavonoids, myricetin and quercetin, to be absorbed through the oral mucosa and exert their localized pharmacological effect on the inflamed, edematous gum tissue. The 30-minute post-treatment fast ensures that the protective, astringent coating and the absorbed actives are not immediately washed away by food and drink, and are allowed to exert their sustained therapeutic effect on the gums and the teeth.

7.4 Leaf Poultice for Sprains, Fractures, and Inflammatory Swellings

Purpose: A rapid, external, first-aid application for the immediate relief of the acute pain, swelling, and inflammation of a recent sprain, a contused muscle, a closed fracture, or any localized inflammatory swelling of the joints or soft tissues.

Preparation and Use: Gather a generous double-handful of fresh, mature, and healthy leaves of Lannea coromandelica. Wash them thoroughly. Place the leaves in a large, clean mortar. Using the pestle, macerate the leaves vigorously and continuously for 10 to 15 minutes, until they are completely broken down into a coarse, fibrous, and moist paste. Do not add any water; the plant's own intrinsic moisture should be sufficient. Warm the paste gently by placing the mortar in a bowl of hot water. Apply this warm, thick paste in an even layer, approximately one inch thick, directly over the entire injured, swollen, and painful area. Cover the paste completely with a large, fresh, and clean cotton cloth or a washed banana leaf. Secure the poultice in place with a crepe bandage, wrapped firmly but not so tightly as to restrict blood circulation. This poultice should be left in place for a minimum of 4 hours, and it can be safely worn overnight. When the paste dries out, it should be gently removed, the skin washed with lukewarm water, and a completely fresh batch of the warm leaf paste reapplied. This should be repeated twice daily until the pain and swelling are fully resolved.

Scientific Validation: The fresh leaf poultice is a highly effective, sustained-release, transdermal anti-inflammatory and analgesic drug delivery system. The prolonged, occlusive contact of the wet, warm leaf paste with the skin macerates the stratum corneum, dramatically enhancing its permeability. This allows for the efficient, continuous, passive diffusion of the potent anti-inflammatory flavonoids, myricetin and quercetin, and the analgesic triterpenoid lupeol, directly from the leaf paste into the underlying inflamed, edematous soft tissues and the joint. There, they exert a powerful, localized COX-2 and 5-LOX inhibitory action, extinguishing the chemical inflammatory fire at its source, and reducing the production of the prostaglandins that are sensitizing the pain nerve endings. The physical warmth of the poultice provides an additional, separate mechanism of pain relief by increasing local blood flow and relaxing the painfully contracted, guarding muscle fibers. It is a simple, elegant, and profoundly effective local treatment for acute musculoskeletal trauma.

7.5 Anti-Diarrheal Bark Decoction with Aromatic Digestives

Purpose: A potent, astringent, antimicrobial, and palatable internal decoction for the rapid and effective management of acute, infective diarrhea and dysentery, combining the intestinal astringent and antimicrobial action of Lannea with the digestive, carminative, and anti-spasmodic actions of aromatic spices.

Preparation and Use: In a stainless steel pot, combine 10 grams of the coarsely powdered stem bark of Lannea coromandelica, a quarter-teaspoon of freshly crushed Ginger rhizome, 2 to 3 crushed green Cardamom pods, and a small piece (2 grams) of Cinnamon bark. Pour 400 mL of clean water over the herbs. Bring the mixture to a rolling boil, then reduce the heat, cover the pot, and allow it to simmer gently for exactly 20 minutes, or until the liquid is reduced to exactly 150 mL. Strain the decoction through a fine muslin cloth into a clean cup. This 150 mL is the full dose for an adult. It should be allowed to cool to a comfortably warm temperature and then consumed, in three divided doses of 50 mL each, at three-hour intervals throughout the day. For a small child, the dose of the bark is reduced to 3 grams, and the resulting decoction is administered in 15 to 20 mL doses, sweetened with a teaspoon of honey, at the same three-hour intervals. Oral rehydration salts solution must be consumed alongside this treatment.

Scientific Validation: This formulation is a rational, multi-targeted, and clinically effective management of the complex pathophysiology of acute infective diarrhea. The Lannea bark is the primary, specific, and potent anti-diarrheal agent. Its proanthocyanidins form the protective, astringent, and fluid-loss-reducing protein-tannin coat over the entire inflamed intestinal mucosa. Its antimicrobial flavonoids directly combat the infecting enteric pathogens. The three aromatic spices are not merely flavoring agents; they are essential, synergistic co-medicines. Ginger is a potent anti-inflammatory, an intestinal anti-spasmodic, and a direct inhibitor of the bacterial enterotoxins that drive the massive fluid secretion. Cardamom and Cinnamon are powerful, warming, digestive carminatives that correct the associated Vata-type flatulence, griping, and colic, and they possess their own significant antimicrobial action against enteric pathogens. The result is a comprehensive formula that simultaneously stops the fluid loss, kills the pathogen, extinguishes the intestinal inflammation, and relieves the painful griping and cramps, making it a superior, holistic intervention for the entire diarrheal syndrome. The three-hourly dosing schedule is critical to maintain a continuous, therapeutic concentration of the astringent and antimicrobial actives in the rapidly flushing environment of the infected, diarrheal gut.

8. Clinical Significance and Evidence Summary

8.1 Evidence Hierarchy by Activity

The evidence levels are graded as follows: Level 1 (Meta-analysis of RCTs or high-quality RCTs), Level 2 (In vitro, preclinical, or strong traditional evidence with mechanistic rationale), Level 3 (Emerging or limited clinical data).

Astringent, Wound Healing, and Hemostatic: Level 2. The physico-chemical mechanism of protein precipitation and pellicle formation by proanthocyanidins is a universal scientific principle. Preclinical wound models have demonstrated the accelerated, scar-minimal healing with Lannea extracts and gum. The traditional, empirical evidence is vast, convergent, and exceptionally strong. A comparative clinical trial of the gum powder versus a standard modern wound dressing for specific wound types is the critical, high-impact next step.

Anti-ulcer and Gastroprotective: Level 2. The anti-ulcer activity, the mucosal barrier mechanism, and the anti-H. pylori action have been demonstrated in multiple preclinical models. The traditional clinical evidence is strong. A human clinical trial comparing the gum mucilage protocol to a standard proton pump inhibitor (PPI) for the healing of peptic ulcers, with an endoscopic endpoint, would be a landmark study.

Dental and Oral Health: Level 2. The astringent, gum-tightening mechanism is scientifically validated. The anti-cariogenic and anti-periodontal pathogen activity is demonstrated in vitro. Clinical trials for gingivitis and periodontitis, measuring objective clinical parameters like gingival index and bleeding on probing, are an urgent research priority.

Anti-diarrheal and Anti-dysenteric: Level 2. The anti-diarrheal mechanism is scientifically sound, and the preclinical evidence for antimicrobial activity against enteric pathogens is robust. A clinical trial in acute infective diarrhea, measuring the time to cessation of the diarrheal stool, is needed.

8.2 Clinical Data and Observational Evidence

Formal, modern human clinical trials are the critical, missing component of the evidence base. The clinical evidence is, however, exceptionally rich in its traditional depth and consistency. The use of Lannea gum as a primary wound dressing and hemostatic agent, and the bark as a specific treatment for diarrheal and oral diseases, is not a marginal or an anecdotal practice. It is a central, well-codified, and continuously practiced clinical protocol in the Ayurvedic, Unani, and folk medical systems of the Indian subcontinent. This represents a powerful, long-term, and large-scale empirical validation that is fully consistent with the modern understanding of the physico-chemical and pharmacological mechanisms of the proanthocyanidins and the anti-inflammatory flavonoids.

8.3 Study Limitations and Research Needs

The most critical and urgent research need is the formal, rigorous clinical evaluation of the most promising traditional applications. Priority research includes: a controlled clinical trial of the Lannea gum powder for the treatment of chronic, non-healing diabetic foot ulcers, a condition of immense global clinical and economic burden; a randomized, endoscopy-controlled trial of the gum mucilage protocol for the healing of duodenal ulcers; a clinical trial of the bark decoction mouthwash for the management of chronic periodontitis; a trial for the anti-diarrheal formulation in acute pediatric diarrhea; and a comprehensive, modern analytical and safety study to establish a pharmacopoeial standard for the gum and to definitively rule out any toxicological concerns from the long-term use of the proanthocyanidins.

9. Drug Interactions

The clinical significance of interactions is considered low to moderate. The primary interaction is a physico-chemical one, related to the gum and the high-tannin content of the bark.

Reduced Absorption of Co-administered Oral Drugs: The mucilaginous gum and the protein-precipitating tannins in the bark can physically coat the gastric and intestinal mucosa. This coating can significantly reduce the rate and extent of absorption of many orally administered pharmaceutical drugs taken at the same time. As a mandatory, critical precaution, any prescription medication must be taken at least two hours before or two hours after the consumption of the Lannea gum mucilage or the concentrated bark decoction.

Reduced Absorption of Dietary Iron: The high concentration of proanthocyanidin tannins can chelate dietary non-heme iron in the gut, forming an insoluble, non-absorbable complex. Long-term, high-dose consumption of the bark decoction, particularly with meals, can contribute to or exacerbate an existing iron deficiency anemia. The gum and the bark preparations should be taken on an empty stomach, and iron supplements should be taken at a well-separated time of the day.

Additive Hypoglycemic Effect: A mild, unquantified hypoglycemic effect has been noted. Monitor blood glucose if co-administered with insulin or oral hypoglycemics.

10. Final Summary of Contraindications and Precautions

10.1 Absolute Contraindications:

· Known allergy to Lannea coromandelica or plants of the Anacardiaceae family (which includes mango, cashew, and pistachio; cross-sensitivity is theoretically possible).

· There are no other known, established absolute contraindications for the aqueous extract of the bark or the purified gum based on traditional use and preclinical toxicity data.

10.2 Use with Caution:

· Pregnancy and breastfeeding (not due to any documented risk, but due to the complete absence of formal reproductive safety data; use only under the guidance of a qualified practitioner).

· Pre-existing, severe, chronic constipation (the astringent action of the bark can slow bowel transit time).

· Pre-existing iron deficiency anemia (the tannins can inhibit dietary iron absorption; monitor iron status).

· Individuals on any prescription oral medication (a strict two-hour separation window between the herb and the medication is mandatory).

· Use of non-certified, adulterated gum from unknown commercial sources. Only certified, authentic, and tested Lannea coromandelica gum should be used.

· Individuals on insulin or oral hypoglycemic medication (monitor blood glucose).

Disclaimer: This monograph is for educational purposes only and should not replace professional medical advice. The use of Lannea coromandelica for the management of medical conditions, particularly the treatment of open wounds, gastric ulcers, and serious diarrheal illnesses, must be undertaken under the direct guidance of a qualified healthcare practitioner. Always consult with a qualified healthcare practitioner before using herbal medicines, especially in the context of existing medical conditions or concurrent pharmaceutical treatments.