Capsella bursa-pastoris (Brassicaceae) Shepherd's Purse

Capsella bursa-pastoris, commonly known as shepherd's purse, is a small, annual flowering plant native to Europe and Asia Minor that has become one of the most widespread weeds on Earth, second only to knotgrass in global distribution . It is a member of the Brassicaceae family and is known for its distinctive heart-shaped or triangular seed pods that resemble the purses carried by medieval shepherds . Despite its weedy reputation, this humble plant has been a valued food and medicine for millennia, with archaeological evidence showing its use as early as 5950 BCE at Neolithic settlements in Turkey . For centuries, it has been a cornerstone of traditional medicine across Europe, Asia, and North America, used to treat bleeding disorders, inflammation, and digestive ailments. Modern scientific research has begun to validate these traditional uses, revealing a plant rich in flavonoids, phenolic acids, and unique organosulfur compounds with significant haemostatic, anti-inflammatory, antioxidant, and anticancer potential. Its monograph is now included in the European Pharmacopoeia, officially recognising its therapeutic value .

1. Taxonomic Insights

Species: Capsella bursa-pastoris (L.) Medik.

Family: Brassicaceae (Cruciferae)

The Brassicaceae family, commonly known as the mustard or cabbage family, is a large group of flowering plants comprising over 3,700 species. It is distinguished by its four-petalled flowers arranged in a cross shape (hence the old name Cruciferae) and its characteristic seed pods called silicles or siliques. This family is of immense economic importance, providing staple vegetables like cabbage, broccoli, and kale, as well as oilseeds like rapeseed and condiments like mustard. The genus Capsella includes about five species of small, weedy herbs, with C. bursa-pastoris being the most widespread and variable. Recent research has focused on the genus as an evolutionary model due to its close relationship with thale cress (Arabidopsis thaliana) and the complex genetic origins of its four complete sets of chromosomes .

Taxonomic Note: The species was first described by Carl Linnaeus as Thlaspi bursa-pastoris before being moved to the genus Capsella by Medikus in 1792 . The genus name Capsella is Latin for "a little box," referring to the shape of its fruit. The specific epithet bursa-pastoris translates literally to "shepherd's purse," describing the same distinctive heart-shaped fruits that have captured human imagination for centuries . The plant is a self-pollinating annual, which has led to the development of hundreds of described subspecies and varieties that vary in height, leaf shape, and fruit size in response to environmental factors . It grows to a height of 10 to 40 cm, with basal leaves forming a rosette and smaller, clasping stem leaves arranged alternately. The flowers are small and white, with four petals that are about twice as long as the sepals, and are grouped in elongated racemes .

Related Herbs from the Same Family:

· Brassica oleracea (Wild Cabbage): The progenitor of many important vegetables including kale, broccoli, and cauliflower, sharing the family's characteristic glucosinolate content.

· Armoracia rusticana (Horseradish): A pungent root used as a condiment and for its antimicrobial properties, rich in the same isothiocyanates found in shepherd's purse.

· Sinapis alba (White Mustard): A plant valued for its seeds, which are used to produce the condiment mustard, and for its traditional medicinal uses for respiratory and rheumatic conditions.

· Lepidium sativum (Garden Cress): A fast-growing edible herb used in salads and for its peppery flavour, sharing similar phytochemical profiles and traditional uses.

2. Common Names

Scientific Name: Capsella bursa-pastoris | English: Shepherd's Purse, Shepherd's-purse, Common Shepherd's Purse | Hindi: Not widely recorded | Chinese: 荠菜 (Jì cài), Ti Mi Ts'ai, Chi Ts'ai | Spanish: Bolsa de pastor, Paniquesillo | French: Bourse-à-pasteur | German: Hirtentäschelkraut | Italian: Borsa del pastore | Turkish: Çoban çantası

3. Medicinal Uses

Primary Actions: Haemostatic, Anti-inflammatory, Antioxidant

Secondary Actions: Antimicrobial, Anticancer, Hepatoprotective, Diuretic, Sedative, Astringent, Uterine Tonic

Medicinal Parts:

The aerial parts of the plant, particularly the herb collected after flowering, are the primary parts used medicinally .

· Herb (Aerial Parts): This is the official medicinal raw material (Bursae pastoris herba) used in traditional medicine and modern phytotherapy. It is used to stop bleeding, reduce inflammation, and support gynaecological health .

· Seeds: Recent research has identified unique organosulfur compounds in the seeds with potential anti-inflammatory and anti-radiation activities . In traditional Chinese medicine, seeds are chewed to improve vision and alleviate ocular discomfort .

4. Phytochemicals Specific to the Plant and Their Action

The therapeutic potential of Capsella bursa-pastoris is attributed to its diverse and rich phytochemical profile, which includes flavonoids, phenolic acids, and unique organosulfur compounds.

· Flavonoids and Phenolic Acids: Shepherd's purse is a rich source of flavonoids, particularly in its flowers. Key flavonoids include quercetin, kaempferol, luteolin, apigenin, and their glycosides such as quercetin-3-O-glucoside and kaempferol-3-O-rutinoside . Hyperoside has been identified as the predominant flavonoid in the flowers . Important phenolic acids include chlorogenic acid, caffeic acid, ferulic acid, and gallic acid . These compounds are primarily responsible for the plant's potent antioxidant, anti-inflammatory, and anticancer activities.

· Organosulfur Compounds: A significant recent discovery is the presence of novel organosulfur compounds in the seeds, including bursapastoris A and B (two new sulphur glycosides) and 10-(methylsulfinyl)decanoic acid and 11-(methylsulfinyl)undecanoic acid (two new natural products) . These compounds, which are characteristic of the Brassicaceae family, have shown favourable docking to NF-kappaB, a key protein involved in inflammatory responses, suggesting their role in the plant's anti-inflammatory activity .

· Other Compounds: The plant also contains phytosterols (with beta-sitosterol being the most abundant), amino acids (tyrosine and arginine), organic acids (quinic, malic, citric), fatty acids (palmitic, linolenic, linoleic), essential oil, biogenic amines (choline, acetylcholine), vitamins (A, C, thiamine, niacin), and bioelements .

5. Traditional and Ethnobotanical Uses Covering the Medicinal Uses

Rakta Pitta and Raktasrava (Bleeding Disorders and Haemorrhage)

Formulation: Infusion, tincture, liquid extract, or fresh juice.

Preparation and Use: Shepherd's purse has been used for centuries as a haemostatic remedy, particularly for uterine bleeding and heavy menstrual bleeding (menorrhagia) . This use dates back to Hippocrates (460-370 BCE), who recognised it as a "uterine agent" . In modern clinical research, a 96% hydroalcoholic extract of the herb administered in capsules containing 320 mg of extract (equivalent to 2.5 g of the herb) every 12 hours was found to be more effective in stopping heavy menstrual bleeding than 500 mg of mefenamic acid taken every 8 hours . A strong decoction is used traditionally for uterine bleeding, and liquid extracts are taken 4-7 times daily for this purpose .

Reasoning: The haemostatic effect is attributed to the plant's astringent properties, possibly due to its high tannin and flavonoid content, and its ability to constrict blood vessels . The presence of a peptide with effects similar to oxytocin has also been suggested as a contributing factor .

Yakrit Vikara (Liver Disorders)

Formulation: Decoction or infusion.

Preparation and Use: Shepherd's purse has a long history of use in traditional medicine for liver complaints . In the Altai region, it has been used for liver problems and metabolic disorders. Modern research has confirmed its hepatoprotective effects .

Reasoning: The hepatoprotective activity is likely due to the combined antioxidant and anti-inflammatory actions of its phenolic compounds, particularly flavonoids, which can protect liver cells from oxidative damage.

Shotha (Inflammation) and Jwara (Fever)

Formulation: Infusion or decoction.

Preparation and Use: The plant is traditionally used as an anti-inflammatory and antipyretic (fever-reducing) agent . It has been used in China and Japan to lower elevated body temperatures. It is also recommended for inflammatory skin conditions, including skin ulcers . Modern studies have confirmed its anti-inflammatory and antioxidant activities .

Reasoning: The anti-inflammatory effects are linked to the inhibition of NF-kappaB by its organosulfur compounds and the antioxidant properties of its abundant flavonoids .

Krimi Roga (Worm Infestations) and Gastrointestinal Disorders

Formulation: Seed pods or whole plant.

Preparation and Use: Some Native American tribes, including the Mohegan, used the seed pods to treat internal worms (anthelmintic) . Shepherd's purse has also been traditionally used for dysentery, gastritis, and other gastrointestinal issues . It has been listed as an antidiarrheal remedy by several Indigenous groups .

Reasoning: These uses are supported by the plant's antimicrobial activity, which has been confirmed in modern research .

Chinta and Nidra (Anxiety and Sleep)

Formulation: Infusion.

Preparation and Use: Shepherd's purse has been used as a mild sedative in traditional medicine . It has been documented as having sedative and cardiotonic effects .

Reasoning: The sedative properties may be due to its biogenic amine content, including choline and acetylcholine, which can influence the nervous system.

6. Healing Recipes, Decoctions, and Preparations

Standard Infusion for Heavy Menstrual Bleeding

Purpose: To reduce heavy menstrual bleeding.

Preparation and Use:

1. Add 20 g of dried Capsella bursa-pastoris herb (about a heaped tablespoon) to 250 ml of boiling water .

2. Infuse for 5-10 minutes.

3. Strain and drink a glass 3-4 times a day. The liquid extract can also be taken 4-7 times daily .

Strong Decoction for Uterine Bleeding

Purpose: For more significant uterine bleeding.

Preparation and Use:

1. Prepare a strong decoction by boiling the herb in water for a longer period.

2. This can be taken with the addition of barberry, lemon, or currant juice.

3. Always consult a healthcare professional before use .

Anti-inflammatory Tea

Purpose: To help with general inflammation.

Preparation and Use:

1. Steep 1-2 teaspoons of dried herb in a cup of hot water for 5-10 minutes.

2. Strain and drink up to three times daily.

Topical Application for Wounds

Purpose: For minor wounds and skin ulcers.

Preparation and Use:

1. Apply a poultice of fresh, crushed leaves directly to the affected area.

2. The herb's astringent and antimicrobial properties may help promote wound healing .

Culinary Uses of Capsella bursa-pastoris (Shepherd's Purse)

Beyond its medicinal uses, shepherd's purse is a highly nutritious wild edible that has sustained communities for millennia .

1. Leaves as a Green Vegetable

The leaves are the most commonly consumed part.

· Preparation: Young leaves are harvested from the basal rosette in early spring before the plant flowers. They can be eaten raw in salads or cooked as a potherb in soups, stews, and stir-fries.

· Flavour Profile: The leaves have a mild, slightly peppery flavour similar to other mustards, making them a nutritious and flavourful addition to dishes. The Cherokee used them as a spice .

2. Seeds as Flour

The seeds have been used as a food source.

· Preparation: The Chiricahua and Mescalero Apache ground the seeds into flour to make bread .

· Flavour Profile: The seeds have a mild, nutty flavour and can be used to supplement other flours. They are also known to stimulate digestive juices .

3. Young Seed Pods

· Preparation: The green, immature seed pods can be eaten raw or cooked.

· Flavour Profile: They have a mild, slightly peppery taste and add a pleasant texture to salads.

Foraging and Preparation Notes

Harvesting: The best time to harvest the young leaves for food is early spring, before the plant sends up its flowering stalk. The herb for medicinal use is collected after flowering, when the active compounds are most concentrated . Seeds are harvested when ripe.

Sustainability: As one of the most common weeds on Earth, shepherd's purse is an abundant and sustainable resource. Harvesting should always be done from areas free from pesticides and pollutants.

7. In-Depth Phytochemical Profile and Clinical Significance of Capsella bursa-pastoris (Shepherd's Purse)

Introduction

Capsella bursa-pastoris, the shepherd's purse, is a remarkable example of a common weed that has risen to become an officially recognised medicinal plant, now included in the European Pharmacopoeia . Its journey from an ancient wild food and folk remedy to a scientifically validated therapeutic agent is a testament to the power of traditional knowledge. Modern research has uncovered a complex phytochemistry that includes abundant flavonoids, potent phenolic acids, and unique organosulfur compounds. This rich chemical profile underpins its haemostatic, anti-inflammatory, antioxidant, and anticancer activities, providing a mechanistic basis for its long-standing use in gynaecology, hepatology, and the treatment of inflammatory conditions.

1. Organosulfur Compounds: The Anti-inflammatory and Chemo-preventive Arm

Key Compounds: Bursapastoris A and B (sulphur glycosides), 10-(methylsulfinyl)decanoic acid, 11-(methylsulfinyl)undecanoic acid, sulforaphane .

Pharmacological Profile: The discovery of these new organosulfur compounds in the seeds of C. bursa-pastoris is a major recent finding . These compounds have shown favourable molecular docking to NF-kappaB, a key protein involved in inflammatory and cancer-related pathways . Sulforaphane, an isothiocyanate common in the Brassicaceae family, is a well-known potent chemo-preventive agent that can prevent the formation of tumours .

Actions and Clinical Relevance:

· Anti-inflammatory: The inhibition of NF-kappaB is a critical mechanism for reducing inflammation. This supports the plant's traditional use for inflammatory conditions .

· Anticancer: The presence of sulforaphane and other organosulfur compounds suggests significant anticancer potential. These compounds can induce apoptosis in cancer cells and inhibit tumour development .

2. Flavonoids: The Antioxidant, Anti-inflammatory, and Haemostatic Arm

Key Compounds: Quercetin, Kaempferol, Luteolin, Apigenin, Hyperoside.

Quantitative Profile: The flowers of shepherd's purse have been found to have the highest flavonoid content, with hyperoside being a major component .

Actions and Clinical Relevance:

· Antioxidant: The flavonoids are powerful antioxidants that scavenge free radicals and reduce oxidative stress, a key driver of chronic disease .

· Anti-inflammatory: These compounds can inhibit inflammatory mediators and pathways, contributing to the plant's overall anti-inflammatory activity .

· Haemostatic: Flavonoids are also believed to contribute to the plant's haemostatic effect by strengthening capillary walls and reducing bleeding.

3. Phenolic Acids and Other Compounds: The Hepatoprotective and Antimicrobial Arm

Key Compounds: Chlorogenic Acid, Caffeic Acid, Ferulic Acid, Gallic Acid.

Pharmacological Profile: Shepherd's purse is rich in these phenolic acids, which are well-known for their health-promoting properties.

Actions and Clinical Relevance:

· Hepatoprotective: Chlorogenic acid and other phenolics have been shown to protect liver cells from damage, supporting the plant's traditional use for liver disorders .

· Antimicrobial: Phenolic acids contribute to the plant's broad-spectrum antimicrobial activity, helping to fight off infections .

An Integrated View of Healing in Capsella bursa-pastoris

· For Gynaecological Health: Shepherd's purse is most clinically significant for its use in reducing heavy menstrual bleeding. The combination of its haemostatic flavonoids and uterine-contracting compounds makes it a potent and effective remedy for menorrhagia .

· For Inflammation and Chronic Disease: The synergistic action of its flavonoids, phenolic acids, and organosulfur compounds provides a powerful multi-targeted approach to combating inflammation and the oxidative stress that underlies many chronic diseases, including cancer .

· For Liver and Digestive Health: Its hepatoprotective and antimicrobial properties support its traditional use as a gentle tonic for the liver and digestive system .

Toxicological Profile and Quality Control

Safety Profile: Capsella bursa-pastoris is generally considered safe for medicinal use at traditional doses. It has a monograph in the European Pharmacopoeia and is recognised by the EMA for its use in reducing heavy menstrual bleeding . However, comprehensive safety data for long-term use and concentrated extracts are still emerging. As with any medicinal plant, it should be used under the guidance of a qualified healthcare professional, especially during pregnancy and lactation.

Quality Control Parameters: The identification of key bioactive compounds, such as hyperoside and organosulfur compounds, provides a basis for standardising extracts for quality control and ensuring consistency between batches. The official monograph in the European Pharmacopoeia establishes quality standards for the herbal raw material .

Conclusion: Capsella bursa-pastoris is a powerful testament to the adage that the most common plants often hold the greatest secrets. From a humble weed to a plant with an official pharmacopoeial monograph, it has bridged the worlds of ancient folk medicine and modern scientific validation. The recent discovery of its unique organosulfur compounds and the clinical confirmation of its effectiveness in treating heavy menstrual bleeding are just the latest chapters in its ongoing story. Shepherd's purse stands as a valuable and accessible medicinal and nutritional resource, representing a beautiful confluence of tradition, science, and practical utility.

Disclaimer:

Capsella bursa-pastoris is generally considered safe for moderate use, but comprehensive safety data for concentrated extracts and long-term use are still emerging. Pregnant or nursing women should consult a qualified healthcare professional before use. Always consult a qualified healthcare professional before using this plant for medicinal purposes. This information is for educational use only and is not a substitute for professional medical advice.

8. Reference Books, Books for In-depth Study

· European Pharmacopoeia, 11th Edition (2023) - for the official monograph on Bursae pastoris herba .

· Herbal Medicine - A Guide for Health-care Professionals by Newall, C.A., Anderson, L.A. & Phillipson, J.D. (1996) - for comprehensive safety and efficacy data.

· Native American Ethnobotany by Daniel E. Moerman (1998) - for documentation of Indigenous uses in North America .

· A Modern Herbal by Maud Grieve (1931) - for historical and traditional uses.

· Flora Europaea - for taxonomic and distribution details .

· Journal of Ethnopharmacology - for research on traditional uses and phytopharmacology.

· Molecules - for the latest research on organosulfur compounds .

· Life - for research on phytochemical characterisation and antioxidant capacity .

· Nutrients - for comprehensive reviews on traditional uses, bioactive compounds, and new findings .

· Phytochemical and Ethnobotanical Databases (USDA, Dr. Duke's) - for chemical and pharmacological data .

9. Further Study: Plants That Might Interest You Due to Similar Medicinal Properties

1. Silybum marianum (Milk Thistle)

· Species: Silybum marianum | Family: Asteraceae

· Similarities: A thistle renowned for its hepatoprotective properties, sharing a similar traditional use for liver disorders and a rich profile of bioactive flavonoids.

2. Achillea millefolium (Yarrow)

· Species: Achillea millefolium | Family: Asteraceae

· Similarities: A well-known herb with potent haemostatic, anti-inflammatory, and wound-healing properties. It shares shepherd's purse's use for stopping bleeding and reducing inflammation.

3. Urtica dioica (Stinging Nettle)

· Species: Urtica dioica | Family: Urticaceae

· Similarities: A common weed with a long history of use as a nutritive tonic and for its anti-inflammatory properties. It shares a similar profile as a humble plant with significant therapeutic value.

4. Alchemilla vulgaris (Lady's Mantle)

· Species: Alchemilla vulgaris | Family: Rosaceae

· Similarities: A traditional herb used for gynaecological conditions, particularly for heavy menstrual bleeding. It shares shepherd's purse's prominent use as a haemostatic and uterine tonic.

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