Shepherd’s Purse Benefits: What the Evidence Actually Shows

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The shepherd’s purse benefits that hold up best under modern study are narrower than herbal tradition suggests: the European Medicines Agency lists Capsella bursa-pastoris as a traditional herbal medicinal product for reducing heavy menstrual bleeding in women with regular cycles, and two small randomized trials in Iran support that traditional use [EMA HMPC, 2011] [Naafe et al., 2018].

Most other claims — for nosebleeds, low blood pressure, intestinal tone, earaches — rest on long folk tradition rather than human trials. This guide separates what is reasonably supported from what is not, summarizes the active compounds, gives the actual EMA-recommended doses, and explains who should not use this herb at all.

What shepherd’s purse is

Shepherd’s purse (Capsella bursa-pastoris (L.) Medik.) is an annual herb in the mustard family (Brassicaceae), recognizable by its small white flowers and flat, triangular seed pods that resemble the leather purses once carried by shepherds. Native to the Mediterranean basin, it now grows almost everywhere — roadsides, gardens, cracks in pavement — and is one of the most widely distributed wild plants on Earth [Łukaszyk et al., 2024].

The whole above-ground plant is what’s used medicinally and culinarily. Young leaves taste peppery and cabbage-like, and the herb is eaten as a vegetable in parts of East Asia. In Western herbal medicine the dried plant has been used for centuries as an astringent and hemostatic — a substance to help slow bleeding [EMA HMPC, 2011].

Common names you’ll see on labels: pick-pocket, St. James weed, mother’s heart, shepherd’s pouch, toywort.

What’s actually in it

A 2024 review in Nutrients catalogued the chemistry that underlies the herb’s traditional uses. The active fraction is a mix of plant compounds rather than one star ingredient [Łukaszyk et al., 2024].

Compound group	What it’s thought to do
Flavonoids (quercetin, kaempferol, luteolin, diosmin)	Antioxidant; may support capillary tone — diosmin is an active ingredient in several prescription venous-tonic drugs.
Biogenic amines (choline, acetylcholine, tyramine, histamine)	Act on the autonomic nervous system; can constrict small arterioles, stimulate uterine muscle, and mildly raise blood pressure.
Glucosinolates and isothiocyanates (sulforaphane and relatives)	Common to the mustard family; under study for anti-inflammatory and antimicrobial effects.
Phenolic acids and peptides	Lab studies link these to anti-inflammatory and uterotonic (uterus-contracting) activity.
Vitamin K and oxalates	Vitamin K may contribute to the herb’s traditional clotting-support reputation. Oxalates matter for people prone to kidney stones.

Two practical takeaways. First, the same biogenic amines that may help slow uterine bleeding can also raise blood pressure — so the herb is not benign in people with hypertension. Second, because the active compounds vary with growing conditions and harvest time, two products with the same label name can have meaningfully different strengths [Łukaszyk et al., 2024].

Shepherd’s purse benefits, by evidence strength

Below is a plain reading of where the evidence is strongest and where it is weakest. The strength labels follow the usual hierarchy: human randomized trials > observational studies > animal studies > lab studies > tradition.

Use	Evidence	Brief summary
Heavy menstrual bleeding (HMB)	Moderate (small RCTs + EMA traditional use)	Two small randomized trials show reduced bleeding versus placebo when added to an NSAID; EMA lists this as a traditional indication.
Early postpartum hemorrhage	Limited (one small RCT)	A 2017 trial in 100 women found added benefit over oxytocin alone, but this is a single small study in a hospital setting.
Nosebleeds, small wounds, bleeding hemorrhoids	Traditional only	Long history of topical and infusion use; no modern RCTs.
Anti-inflammatory / antioxidant effects	Preclinical only	Lab and cell studies show flavonoid-driven effects; not yet tested in human clinical outcomes.
Lowering blood pressure, treating urinary infections, anticancer effects	Weak or none in humans	Animal or in-vitro signals only; no good human trials for these uses.
“Speeding up labor” / uterine atony	Traditional, not supported clinically	Historical use; modern obstetrics relies on oxytocin and ergot derivatives, not shepherd’s purse.

Heavy menstrual bleeding (best human evidence)

This is the use with the strongest modern support. A triple-blind randomized trial published in the Journal of Alternative and Complementary Medicine enrolled 84 women in Tehran with confirmed heavy menstrual bleeding (PBLAC score above 100). All participants took mefenamic acid, an NSAID commonly prescribed for menstrual bleeding. Half were also given two capsules per day of a hydroalcoholic extract of Capsella bursa-pastoris (320 mg each). The other half got starch capsules. By the third menstrual cycle, the shepherd’s-purse group had a significantly greater drop in bleeding volume than the NSAID-plus-placebo group (p < 0.001) [Naafe et al., 2018].

Two important qualifiers. The benefit only became clear by month three — there was no meaningful difference at months one or two. And this was one single-site study; replication in larger and more diverse populations is still needed [Naafe et al., 2018]. The European Medicines Agency’s HMPC monograph classifies shepherd’s purse herb as a traditional herbal medicinal product for HMB in women with regular cycles, only after a doctor has ruled out serious conditions such as fibroids, polyps, or malignancy. That qualifier matters: don’t self-treat unexplained heavy bleeding [EMA HMPC, 2011].

For context on what counts as heavy menstrual bleeding and what else can help, see our overview of what dysmenorrhea is and how to manage it and our guide to herbs for menstrual cramps.

Postpartum bleeding (preliminary clinical evidence)

A 2017 single-blind randomized trial in 100 women at Afzalipour Hospital in Kerman, Iran, tested whether 10 sublingual drops of a hydroalcoholic shepherd’s-purse extract added to standard oxytocin (20 IU in Ringer’s solution) reduced bleeding immediately after a vaginal delivery. The combined treatment reduced postpartum blood loss more than oxytocin alone (p < 0.001) [Ghalandari et al., 2017].

This is encouraging but very preliminary. It was a single hospital, the blinding was single rather than double, and postpartum hemorrhage is a life-threatening complication that must be managed by trained clinicians. Shepherd’s purse is not an at-home remedy for postpartum bleeding. If you delivered recently and are bleeding heavily, contact your provider or emergency services.

Nosebleeds and minor wounds (traditional use, limited modern data)

European and East Asian folk medicine has used shepherd’s purse for nosebleeds — typically as gauze packing soaked in an infusion — and for skin wounds or hemorrhoidal bleeding. Modern controlled trials in these settings are essentially absent [Łukaszyk et al., 2024]. The general first-aid measures for a nosebleed (lean forward, pinch the soft part of the nose for 10–15 minutes, breathe through the mouth) work for most cases and remain the appropriate first step. For bleeding hemorrhoids, see our review of herbs for hemorrhoids — several have stronger topical evidence than shepherd’s purse.

Anti-inflammatory and antioxidant effects (mostly lab data)

Polyphenols from shepherd’s purse (especially luteolin and quercetin glycosides) reduce inflammatory signaling in immune cells in culture by blocking NF-κB and MAPK pathways and inducing heme oxygenase-1 [Peng et al., 2019]. This is the same kind of pathway-level activity reported for many edible plants from the cabbage family, and it’s interesting biology — but cell-culture effects do not translate one-to-one to people. There are no large human trials testing shepherd’s purse for arthritis, inflammatory bowel disease, or any other inflammatory condition.

Claims with weak or no human evidence

You’ll see shepherd’s purse marketed for low blood pressure, urinary tract infections, fevers, bedwetting, earaches, diarrhea, and even cancer. Animal studies and old herbal texts mention most of these uses, but there are no good human trials. Treat these claims as unproven. If you have a UTI, you need a urine culture and likely antibiotics, not an herbal infusion.

How shepherd’s purse is taken

The clearest dosing guidance comes from the EMA monograph, which is based on long-standing European traditional use. The monograph applies to adults; use in those under 18 is not recommended [EMA HMPC, 2011].

Form	EMA-listed adult dose	Practical notes
Comminuted herb as tea	1–5 g per cup, 2–4 times daily (3–20 g total per day)	Pour just-boiled water over the herb and steep about 10 minutes. Start lower; review after one cycle.
Liquid extract (1:1 in 25% ethanol)	1–4 mL per dose, three times daily (3–12 mL per day)	Concentrated; follow the manufacturer’s measure. Not for anyone who must avoid alcohol.
Capsules (extract)	Used in trials at 320 mg twice daily for HMB	Trial dose; commercial products vary widely in extract strength.
Sublingual drops	10 drops once, used in the postpartum trial	Clinical setting only — not relevant for at-home use.

For menstrual indications, the EMA monograph recommends starting 3–5 days before the expected period and continuing through bleeding. Across all forms, if symptoms persist or worsen, stop the herb and contact a clinician [EMA HMPC, 2011].

Practical note: dried shepherd’s purse loses activity quickly. Most herbalists discard stocks older than a year.

Side effects, interactions, and who should avoid it

Common side effects

At ordinary tea or tincture doses, shepherd’s purse is generally well tolerated. Drowsiness, mild changes in blood pressure, and rare changes in thyroid hormone levels have been reported. Larger doses have been linked to heart palpitations [WebMD / Therapeutic Research Center, 2024]. The randomized HMB trial reported no excess of side effects in the herb group beyond what mefenamic acid caused on its own [Naafe et al., 2018].

Drug interactions to know

Three interaction categories are worth flagging:

• Sedatives and CNS depressants. Larger amounts of shepherd’s purse can add to drowsiness from benzodiazepines (lorazepam, clonazepam), zolpidem, opioids, or alcohol [WebMD, 2024].
• Thyroid medication. The herb may reduce thyroid hormone output and interfere with levothyroxine. If you take thyroid medication, avoid it [WebMD, 2024].
• Blood-pressure and heart medications. Because shepherd’s purse contains vasoconstrictive amines, it can push blood pressure up and may interfere with antihypertensives. If you have hypertension and want to use this herb, your provider needs to know and your blood pressure should be checked regularly.

Who should not use shepherd’s purse

• Pregnant women. The herb can stimulate uterine contractions and is rated likely unsafe in pregnancy because of miscarriage risk [WebMD, 2024]. EMA also says use during pregnancy is not recommended due to insufficient data [EMA HMPC, 2011]. For pregnancy-safe nutrition guidance, see foods for pregnant women.
• Breastfeeding women. Safety has not been established; EMA recommends against use during lactation.
• Anyone under 18. The EMA monograph does not recommend use in adolescents and instead refers them to a healthcare professional.
• People with a history of kidney stones. Shepherd’s purse contains oxalates, which can form stones in susceptible people [WebMD, 2024].
• People with thyroid disease. Possible interference with thyroid hormone production and treatment.
• People with heart conditions or uncontrolled high blood pressure. Vasoconstrictive amines may worsen both.
• Anyone scheduled for surgery. Because of CNS and bleeding effects, stop at least two weeks before any planned procedure [WebMD, 2024].

What realistic results look like

For heavy menstrual bleeding the trial data suggest a meaningful but not dramatic effect, layered on top of an NSAID and only becoming clear by the third cycle [Naafe et al., 2018]. This is not a one-cycle fix and it is not a substitute for a workup if bleeding is new, escalating, or accompanied by clots, fatigue, or shortness of breath.

For nosebleeds, simple first-aid pressure handles most episodes. For postpartum bleeding, clinical management — not a home remedy — is what saves lives. And for the broader claims around fevers, infections, blood pressure regulation, or cancer, current evidence is too thin to recommend shepherd’s purse over conventional care. Think of this herb as a narrow, traditional adjunct for one or two specific situations, used briefly and with medical input — not as a general tonic.

When to talk to a healthcare professional

Seek prompt medical evaluation if any of the following apply:

• Soaking through one or more pads or tampons per hour for more than two hours, or passing clots larger than a quarter [Cleveland Clinic, 2023].
• Periods lasting longer than seven days, periods that suddenly become much heavier, or new bleeding between periods.
• Bleeding after menopause, even if it seems minor.
• Postpartum bleeding that soaks through a pad in an hour, large clots after delivery, dizziness, or rapid heartbeat — call emergency services.
• Nosebleeds lasting more than 20 minutes despite pressure, recurrent nosebleeds, or nosebleeds with blood thinners or a known clotting disorder.
• Signs of anemia: pale skin, breathlessness on light exertion, headaches, or extreme tiredness.

For broader context on women’s reproductive concerns, our overview of female disorders and the plants traditionally used to support them is a starting point, not a substitute for evaluation.

Health Disclaimer: This article is for general education only and is not a substitute for advice, diagnosis, or treatment from a qualified medical professional. Shepherd’s purse may interact with prescription medications, is not safe in pregnancy, and is not appropriate for self-managing serious bleeding. Always speak with a clinician before starting any herbal remedy — especially if you are pregnant, breastfeeding, under 18, have a chronic condition, take prescription drugs, are scheduled for surgery, or have new or worsening symptoms. If you are bleeding heavily, bleeding after menopause, or have postpartum bleeding that won’t stop, seek urgent medical care — do not rely on an herbal remedy.

Frequently asked questions

References

1. European Medicines Agency, Committee on Herbal Medicinal Products (HMPC). Community herbal monograph on Capsella bursa-pastoris (L.) Medikus, herba. EMA/HMPC/262766/2010, adopted 12 July 2011.  → View source
2. European Medicines Agency, HMPC. Assessment report on Capsella bursa-pastoris (L.) Medikus, herba. EMA/HMPC/262767/2010, 12 July 2011.  → View source
3. Łukaszyk A, Kwiecień I, Szopa A. Traditional Uses, Bioactive Compounds, and New Findings on Pharmacological, Nutritional, Cosmetic and Biotechnology Utility of Capsella bursa-pastoris. Nutrients. 2024;16(24):4390. doi:10.3390/nu16244390.  → View source
4. Naafe M, Kariman N, Keshavarz Z, Khademi N, Mojab F, Mohammadbeigi A. Effect of Hydroalcoholic Extracts of Capsella bursa-pastoris on Heavy Menstrual Bleeding: A Randomized Clinical Trial. J Altern Complement Med. 2018;24(7):694–700.  → View source
5. Ghalandari S, Kariman N, Sheikhan Z, Mojab F, Mirzaei M, Shahrahmani H. Effect of Hydroalcoholic Extract of Capsella bursa pastoris on Early Postpartum Hemorrhage: A Clinical Trial Study. J Altern Complement Med. 2017;23(10):794–799.  → View source
6. Peng J, Hu T, Li J, et al. Shepherd’s Purse Polyphenols Exert Their Anti-Inflammatory and Antioxidative Effects Associated with Suppressing MAPK and NF-κB Pathways and Heme Oxygenase-1 Activation. Oxid Med Cell Longev. 2019;2019:7202695.  → View source
7. WebMD (Therapeutic Research Center, Natural Medicines). Shepherd’s Purse — Uses, Side Effects, and More. Accessed 2026.  → View source
8. Cleveland Clinic. Menorrhagia (Heavy Menstrual Bleeding): Causes & Treatment. Reviewed 2023.  → View source
9. Healthline. Shepherd’s Purse: Benefits, Uses, and Side Effects. Consumer summary, accessed 2026.  → View source