Yarrow Leaf (Achillea millefolium)

Yarrow leaf (Achillea millefolium) contains anti-inflammatory compounds like chamazulene and flavonoids that modulate immune responses. Clinical research suggests it may help reduce multiple sclerosis relapse rates and improve metabolic parameters.

Origin & History

Yarrow (Achillea millefolium L.) is a flowering herbaceous plant traditionally used in herbal medicine and functional food applications, containing phenolic compounds including apigenin, caffeic acid, and chlorogenic acids. The extract is typically obtained through solvent extraction methods (hydroethanolic, supercritical fluid, or aqueous) to concentrate its bioactive constituents, with optimal extraction achieved using 70% ethanol at 45°C for 1 hour.

Historical & Cultural Context

Yarrow has been used in traditional medicine systems for centuries, with applications in European herbalism for digestive disorders, wound healing, and hemostasis dating back to ancient Greece and Rome. The plant is also used in Traditional Chinese Medicine and Ayurvedic medicine for digestive and circulatory support, with folk medicine applications across temperate regions for gastric disorders and fever reduction.

Health Benefits

• May reduce relapse rates in multiple sclerosis patients - one small study showed decreased annual relapse rate after one year of administration (preliminary evidence)
• Supports metabolic health and insulin sensitivity - animal studies demonstrated improved fasting glucose levels and protection against hepatic steatosis with supercritical fluid extract (preliminary evidence)
• Promotes beneficial gut bacteria growth - in vitro TIM-2 colon model showed stimulation of Lactiplantibacillus and other probiotic strains (preliminary evidence)
• Exhibits antimicrobial activity against foodborne pathogens - demonstrated effectiveness against Listeria innocua with 0.67 log reduction (in vitro evidence)
• Supports wound healing and hemostasis - in vitro studies showed potential as wound healing agent with hemostatic effects from hydroalcoholic extract (preliminary evidence)

How It Works

Yarrow's bioactive compounds, including chamazulene, apigenin, and luteolin, inhibit pro-inflammatory cytokines like TNF-α and IL-1β. The flavonoids activate PPAR-γ pathways, improving insulin sensitivity and glucose metabolism. Sesquiterpene lactones modulate T-cell responses and may reduce autoimmune activity.

Scientific Research

Clinical evidence for yarrow remains limited, with most research conducted in animal models or in vitro systems. One human study demonstrated reduced relapse rates in MS patients after one year of treatment, while animal studies using supercritical fluid extract showed metabolic benefits including improved insulin sensitivity and reduced hepatic steatosis. A 2025 in vitro study using the TIM-2 colon model found prebiotic effects on beneficial gut bacteria.

Clinical Summary

A small human study in multiple sclerosis patients showed reduced annual relapse rates after one year of yarrow administration, though larger trials are needed. Animal studies demonstrate improved fasting glucose levels and insulin sensitivity with yarrow extract supplementation. Most clinical evidence remains preliminary, with limited human trials and small sample sizes. Additional controlled studies are required to establish therapeutic efficacy.

Nutritional Profile

Yarrow leaf (Achillea millefolium) is not consumed in caloric quantities; it is used as an herbal infusion or extract. Its value lies in its diverse bioactive phytochemical profile rather than macronutrient content. Key compounds include: **Sesquiterpene lactones** (chamazulene, achillicin, achillin; ~0.1–0.3% dry weight) responsible for anti-inflammatory activity. **Essential/volatile oils** (0.2–1.0% dry weight) containing 1,8-cineole (~10–20% of oil), camphor (~10–20%), borneol, β-pinene, sabinene, and chamazulene (which gives the oil a blue color; ~1–15% of oil depending on chemotype). **Flavonoids** (apigenin, luteolin, rutin, quercetin, and their glycosides; total flavonoid content approximately 0.5–1.5% dry weight) — apigenin and luteolin contribute anxiolytic and anti-inflammatory effects; bioavailability of flavonoid glycosides is moderate when consumed as tea. **Phenolic acids** (caffeic acid, chlorogenic acid, dicaffeoylquinic acids; ~0.5–2.0% dry weight) acting as antioxidants. **Tannins** (condensed and hydrolyzable; ~2–4% dry weight) contributing astringent and hemostatic properties. **Alkaloids** (achilleine/betonicine, trace amounts ~0.02–0.05%) historically linked to its styptic (bleeding-stopping) reputation. **Coumarins** (umbelliferone, scopoletin; trace to minor amounts). **Polyacetylenes** (ponticaepoxide; trace amounts) with antimicrobial properties. **Minerals** present in modest amounts per cup of infusion include potassium (~15–30 mg), calcium (~8–15 mg), magnesium (~3–8 mg), iron (~0.2–0.5 mg), manganese, and zinc in trace quantities. **Vitamins**: small amounts of vitamin C (~2–5 mg per cup of strong infusion), traces of vitamin K and vitamin A precursors (β-carotene). **Fiber/protein**: negligible in tea preparations; dried herb contains ~10–15% crude protein and ~15–25% crude fiber by weight, but these are not meaningfully consumed in typical use. **Bitter principles** (achillin and related sesquiterpene lactones) stimulate digestive secretions. **Bioavailability notes**: Water-based infusions extract primarily flavonoid glycosides, phenolic acids, tannins, and water-soluble alkaloids effectively. Essential oil components (terpenoids) are only partially extracted in aqueous preparations — hydroalcoholic tinctures or supercritical CO₂ extracts yield significantly higher terpenoid and lipophilic compound concentrations. Chamazulene is formed during steam distillation from matricine/proazulenes and is thus more concentrated in essential oil preparations than in teas. Flavonoid aglycones (apigenin, luteolin) have low oral bioavailability (~1–5%) but glycoside forms in the herb may be partially hydrolyzed by gut microbiota, improving absorption.

Preparation & Dosage

Animal studies used 200-400 mg/kg body weight of extract administered intraperitoneally. Food-grade extracts are optimized at 1 hour extraction in 70% ethanol at 45°C, standardized by phenolic compound content. Human dosing for MS was not specified in available research. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Probiotics, Turmeric, Milk Thistle, Dandelion, Artichoke Leaf

Safety & Interactions

Yarrow is generally well-tolerated but may cause allergic reactions in individuals sensitive to Asteraceae family plants. It can enhance the effects of anticoagulant medications due to coumarin compounds. Pregnant and breastfeeding women should avoid yarrow as it may stimulate uterine contractions. Common side effects include mild digestive upset and skin sensitivity with topical use.