One of Europe's oldest wound herbs, with RCT evidence across menstrual pain, liver protection, and oral mucositis. Commission E and EMA approved for four indications. Clean safety profile but watch drug interactions.
Traditions: European, Indigenous North American, Unani
Multiple traditions agree on use.
Primary wound herb, hemostatic, and diaphoretic for fevers. Recorded by Dioscórides (1st century CE) for wounds and hemorrhage. Common name 'nosebleed plant' reflects pan-European tradition of applying fresh crushed leaves to stop nasal bleeding. Also used for dysmenorrhea, digestive bitters, liver and biliary complaints.
Documented across more than 60 tribal nations in Moerman's Native American Ethnobotany database. Core uses: wound healing and hemostasis, fever management (diaphoretic), digestive complaints, respiratory symptoms. Preparations: fresh leaf poultice, hot infusion, steam.
Known as Biranjasiph. Used as anti-inflammatory, febrifuge, diuretic, and emmenagogue in Afghanistan, Pakistan, and Central Asian traditional medicine.
Six human RCTs across six different conditions — multiple sclerosis, type 2 diabetes, menstrual pain, oral mucositis, IBS (multi-herb), and hemorrhoids. Strongest single study: triple-blind RCT in 75 MS patients over 1 year showing reduced relapse rate and cognitive improvement. Commission E and EMA approved for appetite loss, GI complaints, menstrual cramps, and superficial wounds. No serious adverse events reported across all trials.
75 patients, triple-blind, 1 year: both 250 mg/day and 500 mg/day reduced annual relapse rate, increased time to first relapse, and improved cognitive scores (word-pair learning, PASAT, WCST). At 500 mg/day, MRI lesion volume change was also significantly reduced vs. placebo.
60 adults, 500 mg/day × 90 days: ALT dropped from 28.79 to 24.41 U/L (p=0.017), LDL from 98.90 to 80.86 mg/dL (p=0.001), total cholesterol from 168.3 to 150.1 mg/dL (p=0.006). Blood sugar and HbA1c were unaffected — hepatoprotective and lipid-lowering, not glycemic.
Female students with primary dysmenorrhea: yarrow tea for 3 days at onset of each cycle over 2 cycles significantly reduced VAS pain scores vs. placebo (P<0.0001 by cycle 2). Supported by a 2024 systematic review of 6 trials concluding yarrow is effective and safe for primary dysmenorrhea and menstrual bleeding.
56 cancer patients with chemotherapy-induced oral mucositis gargled yarrow distillate mouthwash (15 mL × 4/day) for 14 days. Mucositis severity score dropped from 2.39 to 0.32 in the yarrow group; the control group worsened or stayed the same (p<0.001).
Taste: Bitter, aromatic, slightly medicinal. Flowers are less bitter than the whole herb. Quite workable once you adjust; honey helps.
Cover the cup while steeping 10–15 minutes — volatile oils escape with steam. Hot infusion for fever and dysmenorrhea. Cold infusion (herb steeped in cold water overnight) for appetite stimulation and digestive bitter use — substantially more bitter, taken before meals.
1:5 ratio in 25–40% ethanol. Preferred form for dysmenorrhea and digestive use in Western herbal practice. Start a few days before expected menstrual onset.
Doses from clinical trials: MS trial used 250–500 mg/day aqueous extract × 1 year; T2D trial used 500 mg/day dried herb × 90 days. Least bitter option. No universal standardization — look for European Pharmacopoeia–compliant material.
Ointment used in 10-day hemorrhoid trial (54 patients): significantly reduced pain and bleeding. Fresh leaves for immediate wound care — crush and apply directly. The alkaloid achilleine reduces bleeding time. Traditional nosebleed arrest: crush leaves, apply to nostril with gentle pressure.
Yarrow sits in an unusual position: six RCTs covering six entirely different conditions, and none produced null results. The evidence is preliminary — most trials enrolled 54–75 participants — but the consistency across mechanistically unrelated conditions reflects a genuinely multi-purpose pharmacology.
The strongest study is a triple-blind RCT in 75 people with relapsing-remitting multiple sclerosis, run over a full year [1]. All participants continued their standard disease-modifying therapy; half also received yarrow aqueous extract (250 or 500 mg/day). Both doses reduced annual relapse rate and increased time to first relapse versus placebo, with improvements on three cognitive measures (word-pair learning, PASAT, and Wisconsin Card Sorting Test). At 500 mg/day, MRI lesion volume change was also lower than in the placebo group. This is add-on therapy — it doesn’t replace standard MS treatment — but the year-long timeframe and triple-blind design make it the most rigorous yarrow trial to date.
For liver enzymes and lipids, a 90-day trial with 60 adults with type 2 diabetes taking 500 mg/day found that liver enzymes dropped significantly — ALT from 28.79 to 24.41 U/L (p=0.017), AST from 24.28 to 18.76 U/L (p=0.007) — as did LDL cholesterol (98.90 to 80.86 mg/dL, p=0.001) and total cholesterol (168.3 to 150.1 mg/dL, p=0.006) [2]. Blood sugar and HbA1c didn’t move. Yarrow appears to protect liver tissue and improve lipid profile in this population, not lower blood glucose.
For menstrual cramps, a randomized trial had female students with primary dysmenorrhea drink yarrow tea for 3 days at the onset of each cycle across 2 cycles [3]. Pain scores improved significantly versus placebo in both cycles, with the effect strengthening in cycle 2 (P<0.0001). A 2024 systematic review covering 6 trials concluded yarrow is “effective and safe” for primary dysmenorrhea and menstrual bleeding reduction [7].
For chemotherapy-induced mouth sores, 56 cancer patients gargled a yarrow distillate mouthwash (15 mL, 4 times daily) for 14 days [4]. Oral mucositis severity in the yarrow group dropped from an average score of 2.39 to 0.32. The control group stayed the same or worsened. That’s a near-complete resolution of a painful, treatment-limiting symptom.
For hemorrhoids (grade 1–2), a 10-day trial with 54 patients applying a 5% yarrow extract ointment 3 times daily found reductions in pain, discomfort during defecation, and bleeding frequency and intensity versus placebo [5]. Itching did not improve.
What regulators have approved: Germany’s Commission E (1990) approved yarrow for appetite loss and dyspeptic ailments [9]. The European Medicines Agency has separate monographs for yarrow herb and flower covering appetite loss, mild GI spasm, menstrual spasm, and superficial wound healing [10] — all based on documented traditional use rather than RCT evidence.
The honest picture: Small samples, inconsistently standardized preparations, mostly single-center trials. The MS study is the methodological outlier in quality. What’s notable is the breadth — liver, immune, menstrual, mucosal, hemorrhoidal — which reflects yarrow’s multi-mechanism pharmacology rather than one drug-like effect. The findings are coherent across independent research groups, which matters more than any single trial.
The genus name tells you something. Achillea comes from the myth of Achilles, who is said to have applied yarrow to his warriors’ wounds at Troy. A wound herb’s two-thousand-year resume compressed into one word.
European herbalism (1st century CE onward):
Indigenous North American traditions (60+ tribal nations): Yarrow grows across North America and was independently adopted by more than 60 tribal nations documented in Moerman’s ethnobotany database [11]. The convergent uses: wound healing and hemostasis (most universal), fever management, digestive complaints, and respiratory symptoms. The Blackfoot, Cree, and Cheyenne used fresh leaf poultices for wounds; the Ojibwe and Cherokee used hot infusions for fever; the Thompson people used decoctions for stomach complaints.
The convergence matters. European physicians, Indigenous healers from dozens of unrelated nations, and Unani practitioners in Central Asia all arrived at the same core applications — hemostasis, fever, and digestive complaints — without communicating with each other. When independent traditions separated by oceans reach the same conclusions about the same plant, the signal is worth taking seriously.
The trial evidence used tea form [3]. Start 1–2 days before your expected period onset and continue through the first 3 days. Cover your cup while steeping 10–15 minutes — the volatile oils that contribute to the antispasmodic effect escape with steam.
Use the cold infusion — the traditional European digestive bitter. Steep 2–4 g dried herb in a cup of cold water overnight in the refrigerator. Strain and drink 20–30 minutes before meals. Bitterness from flavonoids and sesquiterpene lactones stimulates bile and gastric secretion; heating reduces this effect, so don’t warm it up.
Capsules at 500 mg/day, the dose used in the 90-day T2D trial [2]. Tea equivalent is roughly 2 g dried herb × 3 daily. Minimum trial period: 90 days.
First aid: crush a small handful of fresh yarrow leaves and apply directly to the wound. The alkaloid achilleine reduces bleeding time [8] — this is the oldest human use of yarrow and it still works. The plant is common in lawns, meadows, and roadsides across North America and Europe. You likely walk past it.
For hemorrhoids: 5% hydroalcoholic extract ointment, 3 times daily for at least 10 days [5].
Hot infusion, drunk while still warm, then rest. Classic European combination: equal parts yarrow, elderflower, and peppermint as a hot tea. This doesn’t suppress fever pharmaceutically — it supports the body’s sweating response.
Internal use: 2–4 g dried herb or flower, 3 times daily as tea [9]. Tincture equivalent: 2–4 mL (1:5) three times daily. The EMA recommends no more than 2 weeks of self-directed use for GI/appetite complaints, 1 week for menstrual cramps or wound care, without consulting a practitioner [10].
Before you start:
During the trial:
Stop and reassess if:
Yarrow’s most common English name tells a two-sided story. Traditional European herbalists applied the fresh crushed herb to stop nosebleeds — the alkaloid achilleine activates platelets and reduces bleeding time [8]. That part makes pharmacological sense and still works.
The same herbalists also used fresh yarrow to induce nosebleeds deliberately — as a therapeutic bleeding technique, on the theory that drawing blood away from the head would relieve fever or headache. This practice has not survived into modern use. The common name holds both applications at once, without resolving the contradiction.
The fresh herb has a distinctive aromatic scent: camphor-forward, slightly resinous, faintly astringent. Hot yarrow tea is bitter with a herbal depth; flowers are less bitter than the whole herb. If you’ve had chamomile, think something more bitter and more aromatic. Cold infusion amplifies the bitterness substantially — a different experience than the tea, and that difference is the mechanism for its digestive bitter use.
Material matters first: The European Pharmacopoeia distinguishes Millefolii herba (aerial parts — stems, leaves, flowers) from Millefolii flos (flowers only) [10]. Flos preparations are more standardized and preferred for commercial products.
What to look for on labels:
The chemotype problem: Yarrow grows in chemotype-diverse populations across its range — different populations may have camphor-dominant, chamazulene-dominant, or alpha-thujone-dominant essential oils [8]. These are pharmacologically different preparations. A camphor-chemotype yarrow has less anti-inflammatory potency and lower drug-interaction risk than a chamazulene-chemotype; a thujone-dominant chemotype poses different concerns entirely. Reputable suppliers specify botanical source and region. If chemotype is unspecified, you don’t know what you’re getting for anti-inflammatory use.
What to look for:
Avoid: Unbranded loose herb without identity testing, products without lot-specific quality documentation.
Yarrow is one of the most ancient wound herbs in the Western tradition — documented by Dioscórides [12], converged upon by 60+ Indigenous North American nations [11], and given regulatory approval across four distinct indications in Germany and the EU [9][10]. The clinical evidence, while preliminary, is unusually consistent: six RCTs, six different conditions, zero serious adverse events across all of them, including a year-long MS trial [1].
Well-supported uses: Menstrual cramps, digestive bitters and appetite stimulation, first-aid wound and nosebleed care, and fever support. The 90-day T2D liver trial [2] and year-long MS trial [1] point toward deeper therapeutic potential, but those findings need replication at scale before stronger claims can be made.
The real cautions are the drug interactions. A 413% increase in digoxin exposure from quercetin’s P-glycoprotein inhibition is a documented finding in living humans, not a theoretical concern [8]. Warfarin and immunosuppressant interactions are similarly clinically significant. If you’re on any narrow-therapeutic-index drug, treat yarrow as contraindicated without medical supervision.
The Asteraceae allergy contraindication affects a small minority — roughly 1–2% of people [8] — but it matters, and it’s easy to overlook if you haven’t connected past reactions to chamomile or ragweed.
For healthy adults without relevant drug interactions or Asteraceae allergy: yarrow is an old herb with more clinical backing than its humble reputation suggests. Start with the tea.
Duration: Menstrual pain: 2–3 cycles minimum. Digestive and appetite: 1–2 weeks. Liver support: 90 days (trial duration). Wounds and acute bleeding: immediate topical application.
What to notice:
For dysmenorrhea, start tea or tincture 1–2 days before expected onset and continue through the first 3 days of the cycle. Always cover the cup — the anti-inflammatory and antispasmodic volatile oils escape with steam. Cold infusion is a meaningfully different preparation from hot tea: soak 2–4 g herb in cold water overnight, strain, drink 20–30 minutes before meals. For fever, drink the hot infusion warm and rest. Allow at least 2–3 complete cycles before evaluating for menstrual indications.
Generally considered: caution
Contraindications:
Pregnancy/Nursing: Absolutely contraindicated in pregnancy — universally recorded across European, Indigenous North American, and Unani traditions as an emmenagogue (provokes menstruation). Commission E and EMA both contraindicate in pregnancy. Documented uterotonic activity in preclinical studies. Breastfeeding: avoid; insufficient safety data and lipophilic essential oil constituents may transfer to breast milk.
Generally well-tolerated at conventional doses — 6 RCTs reported no serious adverse events, including 1 year of daily use in MS patients. Primary safety concern for topical use: contact dermatitis from alpha-peroxyachifolid (the primary sesquiterpene lactone allergen). Test any new topical preparation on a small skin area before wider use. Do not take the essential oil internally — camphor (harmful at 2g, potentially fatal at 4g in adults) and alpha-thujone (neurotoxic at excess doses) are present in the concentrated oil. These risks do not apply to tea, tincture, or capsule preparations at conventional doses. Drug interactions are the most clinically significant safety concern and affect a real subset of people.