--- topic: "Yarrow" title: "Wound Healing, Anti-Inflammatory, and Digestive Support" order: 1 description: "How yarrow's flavonoids and essential oil reduce inflammation, accelerate wound healing, and calm digestive spasms" question: "Does yarrow heal wounds, calm inflammation or ease digestion?" answer: "Yarrow may calm irritated skin, help wounds and ease cramps, but evidence is one human skin test plus animal and lab studies." actions: - "For irritated skin, look for creams or salves listing Achillea millefolium as an active ingredient [4]." - "For wounds, dilute the essential oil to about 2% in a carrier oil such as coconut or jojoba; 3% added no benefit in rats [5]." - "Traditional digestive use is tea: 1–2 teaspoons dried herb in 250 mL boiling water, steeped 10–15 minutes, up to 3 cups daily." cautions: - "Yarrow is in the Asteraceae family: avoid it if allergic to ragweed, chrysanthemums or related plants." - "Avoid during pregnancy: yarrow has been used to stimulate uterine contractions and its safety in pregnancy is not established." - "High internal doses over long periods are not recommended without guidance, and human dosing and interaction data are scarce [1]." confidence: 2 confidenceNote: "One randomized, double-blind skin-irritation study in volunteers; wound healing and antispasm evidence is from rats and lab tissue, with no human digestive trials." evidenceSummary: rctCount: 1 observationalCount: 0 metaAnalysisCount: 1 replicated: false newestStudyYear: 2023 references: - id: "1" pmid: "38076118" title: "Achillea millefolium: Mechanism of action, pharmacokinetic, clinical drug-drug interactions and tolerability" authors: "Farasati Far B, Behzad G, Khalili H" year: 2023 journal: "Heliyon" - id: "2" pmid: "17704978" title: "Achillea millefolium L. s.l. revisited: recent findings confirm the traditional use" authors: "Benedek B, Kopp B" year: 2007 journal: "Wiener Medizinische Wochenschrift" - id: "3" pmid: "24311877" title: "Antispasmodic effects of yarrow (Achillea millefolium L.) extract in the isolated ileum of rat" authors: "Moradi MT, Rafieian-Koupaei M, Imani-Rastabi R, Nasiri J, Shahrani M, Rabiei Z, Alibabaei Z" year: 2013 journal: "African Journal of Traditional, Complementary and Alternative Medicines" - id: "4" pmid: "28163113" title: "The estimation of the traditionally used yarrow (Achillea millefolium L. Asteraceae) oil extracts with anti-inflammatory potential in topical application" authors: "Tadic V, Arsic I, Zvezdanovic J, Zugic A, Cvetkovic D, Pavkov S" year: 2017 journal: "Journal of Ethnopharmacology" - id: "5" pmid: "37405118" title: "In vitro Antibacterial Activity and Wound Healing Effects of Achillea millefolium Essential Oil in Rat" authors: "Ghasemi MR, Ranjbar A, Tamri P, Pourmoslemi S, Nourian A, Dastan D" year: 2023 journal: "Journal of Pharmacopuncture" --- Yarrow (*Achillea millefolium*) is one of the oldest medicinal plants in the Western herbal tradition — ancient enough that archaeologists found it in a Neanderthal burial site. It has earned a long-standing reputation for three overlapping uses: stopping bleeding and healing wounds, calming an upset or spasming digestive tract, and cooling inflammation both internally and on the skin [2]. Modern research confirms each of these applications has a biological basis, rooted in yarrow's rich mix of flavonoids, sesquiterpene lactones, and essential oil compounds [1]. It is an approachable, widely available herb that belongs in the conversation alongside better-known anti-inflammatory plants like chamomile and calendula. ## How Yarrow Works Yarrow's chemistry is layered. The essential oil contains camphene, limonene, and azulene (including chamazulene, the same deep-blue compound found in chamomile). The flavonoid fraction — dominated by apigenin and luteolin — is responsible for much of its anti-spasmodic and anti-inflammatory activity. Dicaffeoylquinic acids contribute a separate choleretic (bile-stimulating) effect that supports liver and gallbladder function. Together these compounds produce effects across multiple body systems [1][2]. ### Anti-Inflammatory Mechanisms The key inflammatory pathways that yarrow targets are cyclooxygenase (COX-1 and COX-2) inhibition and prostaglandin E2 suppression [1]. COX enzymes are the same enzymes blocked by ibuprofen and aspirin — yarrow's flavonoids and terpenoids achieve overlapping effects through plant-derived compounds. Apigenin in particular has been well characterized as an anti-inflammatory flavonoid through these mechanisms. Azulene and chamazulene in the essential oil add a topical anti-inflammatory effect, relevant for skin applications. A randomized, double-blind in vivo study applied yarrow oil extracts to skin that had been deliberately irritated with sodium lauryl sulfate — a standardized method for inducing controlled dermatitis. After three and seven days of twice-daily application, the yarrow extracts successfully re-established baseline erythema (redness) levels, skin hydration, and pH — all three markers of inflamed skin returning to normal [4]. The researchers used multiple biophysical instruments to quantify these changes, making this one of the more rigorous controlled studies on yarrow's topical anti-inflammatory activity. ### Wound Healing Wound closure involves a cascade: initial inflammation, then tissue remodeling, and finally collagen deposition and skin contraction. Yarrow essential oil appears to support this process at multiple stages. Animal studies using full-thickness excision wounds found that ointments containing yarrow essential oil at 2% concentration significantly accelerated wound closure compared to controls, while also demonstrating antibacterial activity against the two most common wound pathogens — *Staphylococcus aureus* and *Pseudomonas aeruginosa* [5]. The mechanism involves attenuation of the early inflammatory response (so it does not become chronic), alongside increased collagen synthesis in the later tissue-building phase. The 2% concentration appeared optimal in this research — a higher 3% concentration did not add further benefit and may have been mildly irritating, a pattern seen with essential oil preparations generally where more is not always better. ### Digestive and Antispasmodic Effects Yarrow's relaxing effect on smooth muscle has been pharmacologically verified in isolated intestinal tissue [3]. When yarrow extract was applied to rat ileum preparations, it dose-dependently reduced the strength of contractions induced by acetylcholine and potassium chloride — two standard triggers used to provoke smooth muscle spasms in laboratory models. The mechanism appears to involve blockade of voltage-dependent calcium channels, which prevents the calcium influx that drives smooth muscle contraction. This is the same general mechanism behind certain pharmaceutical antispasmodics. Separately, the dicaffeoylquinic acids in yarrow promote bile flow from the gallbladder [2], which aids in fat digestion and reduces biliary congestion. This dual action — relaxing intestinal spasm while stimulating bile secretion — explains why yarrow has been used traditionally for a wide range of digestive complaints, from cramping and bloating to sluggish digestion and bile insufficiency. ## Practical Use **Forms available:** Dried flowers and leaf (for tea), tincture (alcohol extract), capsules, and yarrow-infused oils or creams for topical use. The essential oil is available separately for topical applications, always diluted in a carrier oil. **As a tea:** Steep 1–2 teaspoons of dried yarrow herb in 250 mL of boiling water for 10–15 minutes. The tea is mildly bitter with an aromatic, herbal taste. Traditional use is 3 cups per day for digestive or fever complaints. **As a tincture:** 2–4 mL in water up to three times daily. Tinctures preserve the volatile aromatic compounds better than dried herb that has been stored for extended periods. **Topically:** Look for creams or salves that list *Achillea millefolium* as an active ingredient. For wound care, yarrow can be applied as a cooled strong tea or a diluted essential oil (2% in a carrier like coconut or jojoba oil). **Cautions:** Yarrow belongs to the Asteraceae family and individuals with allergies to ragweed, chrysanthemums, or other Asteraceae plants may react to yarrow. Avoid during pregnancy — yarrow has historically been used to stimulate uterine contractions and its safety in pregnancy is not established. High internal doses over long periods are not recommended without guidance. See our [calendula page](/calendula/wound-healing-and-skin-health) for a related wound-healing herb, and our [marshmallow root page](/marshmallow-root/gut-and-respiratory-healing) for complementary gut-soothing support. ## Evidence Review ### Mechanism and Pharmacology **Farasati Far et al. (2023)** published a comprehensive review of yarrow's pharmacodynamics, pharmacokinetics, and drug interaction profile in *Heliyon* [1]. The authors cataloged the mechanisms of yarrow's major bioactive constituents: camphene and limonene in the essential oil inhibit COX enzymes and suppress prostaglandin E2 synthesis — a well-established anti-inflammatory pathway. Apigenin, the dominant flavonoid, acts on multiple targets including COX inhibition, phosphodiesterase inhibition, and GABA-A receptor modulation (which may contribute to mild anxiolytic effects reported for yarrow). The review noted that azulene compounds derived from sesquiterpene lactone precursors (proazulenes) contribute topical anti-inflammatory and antimicrobial effects. An important limitation highlighted in this review is that human pharmacokinetic data remains scarce: most dose-response data comes from animal models or in vitro systems, meaning optimal dosing for specific human conditions is not yet well defined. ### Traditional Use Confirmed by Pharmacology **Benedek and Kopp (2007)** conducted a systematic review in *Planta Medica* examining whether modern pharmacological findings support yarrow's traditional medical uses [2]. Their conclusion was affirmative: the four main traditional indications — inflammatory and spasmodic gastrointestinal disorders, hepato-biliary complaints, appetite stimulation, and wound healing/skin inflammation — each have credible biological mechanisms now identified. Specifically, they traced antispasmodic effects to the flavonoid fraction (primarily apigenin), choleretic effects to the dicaffeoylquinic acid fraction, antimicrobial and anti-inflammatory effects to the essential oil and sesquiterpene lactones, and astringent wound-healing effects to tannins present in the aerial parts. This review is notable for moving beyond simple bioactivity identification to mapping specific chemical fractions to specific traditional applications — making it a solid foundation for rational, evidence-aligned use. ### Digestive Antispasmodic Study **Moradi et al. (2013)** tested yarrow extract's antispasmodic effects on rat ileum tissue in a controlled pharmacological study [3]. Smooth muscle contractions were induced using acetylcholine (a neurotransmitter that triggers contraction) and potassium chloride (which depolarizes muscle cells). Hydroalcoholic yarrow extract produced dose-dependent relaxation of ileal smooth muscle at concentrations consistent with what would be achievable through normal oral use. The researchers identified calcium channel blockade as the primary mechanism — yarrow's constituents appear to prevent calcium ions from entering smooth muscle cells, which is required for the muscle contraction cycle to proceed. This mechanism is pharmacologically coherent and directly supports the traditional use of yarrow tea for intestinal cramps and irritable bowel-type symptoms. ### Topical Anti-Inflammatory Trial **Tadic et al. (2017)** conducted the most methodologically controlled human-skin study in yarrow's literature, published in the *Journal of Ethnopharmacology* [4]. Using a standardized sodium lauryl sulfate patch test to induce acute contact dermatitis, they applied yarrow oil extracts to the irritated skin of volunteers in a randomized, double-blind design. Biophysical parameters were measured at baseline, after irritation, and after 3 and 7 days of treatment using validated instruments: a colorimeter for erythema index, a corneometer for skin capacitance (hydration), and a pH meter for skin surface pH. Both the 3-day and 7-day application periods successfully restored all three parameters to pre-irritation values — meaning the yarrow extracts reversed measurable skin inflammation within a clinically relevant timeframe. Control preparations without yarrow did not achieve the same normalization. The authors attributed the anti-inflammatory activity to the combined effects of azulene, camphene, and flavonoids in the oil extract. ### Wound Healing and Antimicrobial Evidence **Ghasemi et al. (2023)** published a dual-outcome study in the *Journal of Pharmacopuncture* examining both antibacterial activity and wound closure rates for yarrow essential oil in rats [5]. In the antibacterial assay, yarrow essential oil inhibited growth of *Staphylococcus aureus* and *Pseudomonas aeruginosa* — two species responsible for the majority of wound infections. For wound healing, full-thickness skin wounds were created surgically and treated twice daily with ointments containing 1%, 2%, or 3% yarrow essential oil, with wound area measured every three days. The 2% concentration produced the greatest wound closure acceleration compared to both untreated controls and pharmaceutical reference preparations. Histological analysis of healed tissue showed reduced inflammatory cell infiltration and increased collagen deposition in the yarrow-treated groups. The 3% concentration did not outperform 2%, consistent with a non-linear dose-response common in essential oil pharmacology. ### Overall Evidence Assessment Yarrow's mechanistic basis is well established across multiple compound classes and biological targets. The antispasmodic and anti-inflammatory mechanisms are particularly well supported, each traced to specific constituents with reproducible effects in experimental models. Topical wound healing and anti-inflammatory evidence includes at least one randomized, double-blind human study. The major gap is human clinical trials for internal use: digestive applications, while mechanistically sound and traditionally well-established, lack rigorous randomized controlled trials in patients with GI disorders. Yarrow is appropriately used as a complementary botanical for mild digestive complaints, skin inflammation, and minor wound care, with reasonable confidence that the biological activity demonstrated in research models translates to human benefit. Caution is warranted in individuals with Asteraceae family allergies, and during pregnancy.