Yarrow is one of the most versatile medicinal herbs, with effects that span from stopping bleeding and calming digestive complaints to reducing inflammation and improving cholesterol levels. The flowering tops of the plant contain the highest concentration of active compounds, including flavonoids and essential oils that interact with multiple systems in the body. Here’s what the evidence actually shows.
Wound Healing and Bleeding Control
Yarrow’s oldest and most well-known use is stopping bleeding, a property so central to the plant that its Latin name, Achillea millefolium, references the Greek hero Achilles, who supposedly used it to treat soldiers’ wounds. The plant has genuine hemostatic properties, meaning it helps blood clot faster when applied to cuts, scrapes, or other open wounds. Some of its flavonoid compounds work by interacting with receptors involved in platelet activity, which is the first step your body takes to seal a wound.
Beyond clotting, yarrow also fights bacteria that commonly cause skin infections, including Staphylococcus aureus and Pseudomonas aeruginosa. This combination of stopping bleeding and keeping wounds cleaner likely explains why it has been a battlefield and household remedy for centuries. Traditionally, crushed fresh leaves or a strong tea-soaked compress would be applied directly to the injury. The same properties make it a traditional remedy for hemorrhoids, where its ability to reduce bleeding and inflammation at the skin surface is particularly useful.
Digestive Support
Yarrow is classified as a “bitter herb,” and like other bitters, it stimulates your digestive system in several ways. It increases bile flow from the liver and gallbladder, which helps your body break down fats more efficiently. It also promotes the secretion of digestive enzymes, improving overall nutrient absorption. These effects make it a traditional go-to for loss of appetite and dyspepsia, the umbrella term for uncomfortable fullness, bloating, and nausea after eating.
Yarrow also has antispasmodic properties, meaning it can relax the smooth muscle lining your gut. If you experience cramping, diarrhea, or general abdominal pain tied to digestive upset, this muscle-relaxing effect is the mechanism behind the relief. The herb has been used across multiple traditional medicine systems specifically for these complaints, and its dual action of stimulating healthy digestion while calming spasms makes it unusually well-suited for a range of stomach issues.
Menstrual Health
Yarrow has a long history as a uterine tonic. It increases muscular tone in the uterus and stimulates reproductive activity, which is why herbalists have used it for irregular or painful periods since medieval times. For heavy menstrual bleeding, yarrow appears in treatment plans as both a uterine tonic and an astringent, typically taken as a tincture (20 to 30 drops every two to three hours during acute heavy flow).
This uterine-stimulating property is also why yarrow is strictly avoided during pregnancy. It may induce uterine contractions, creating a real risk of miscarriage. If you’re pregnant or trying to become pregnant, this is not a safe herb to use internally.
Anti-Inflammatory and Skin Benefits
Yarrow extracts show measurable anti-inflammatory activity, which is relevant both internally and when applied to the skin. Topically, it has been used for skin and mucous membrane inflammation, from minor rashes to irritated or damaged tissue. Its antibacterial reach extends to several common pathogens beyond just skin bacteria, including Salmonella and E. coli, which are linked to gastrointestinal infections.
The plant also has significant antioxidant activity. Antioxidants neutralize unstable molecules that damage cells over time, contributing to aging and chronic disease. In yarrow, this antioxidant capacity works alongside its anti-inflammatory effects, which is why the herb shows up in skin-rejuvenation products. A review by the Cosmetic Ingredient Review Expert Panel concluded that yarrow in cosmetic products is safe at current concentrations when formulated to avoid skin sensitization.
Cholesterol and Liver Health
One of the more compelling recent findings comes from a 2024 double-blind clinical trial involving 60 patients with type 2 diabetes. Participants who took 500 mg of yarrow daily for 90 days saw notable improvements in several metabolic markers compared to those taking a placebo. LDL cholesterol dropped from an average of about 99 to 81 mg/dL. Total cholesterol fell from 168 to 150 mg/dL. Triglycerides decreased from 162 to 147 mg/dL. HDL (the protective cholesterol) trended upward slightly but not enough to be statistically significant.
Liver enzymes also improved substantially. Two key markers of liver stress, AST and ALT, both dropped significantly over the three months. AST went from about 24 to 19, and ALT from about 29 to 24. After adjusting for age, gender, and disease duration, the differences between the yarrow group and the placebo group were statistically significant for every measured variable except HDL. This is a single trial with a small sample size, so the results need replication, but the effect sizes are noteworthy for a plant-based supplement.
Fever and Cold Relief
Yarrow is a traditional diaphoretic, meaning it promotes sweating. When you’re running a fever, sweating is your body’s main cooling mechanism, and diaphoretic herbs have long been used to support that process. The flowering tops of the plant are the parts traditionally used for influenza and respiratory illness. Yarrow tea, often combined with elderflower and peppermint, is a classic European remedy for the early stages of colds and fevers. Its antibacterial activity against pneumonia-causing organisms adds a secondary layer of potential benefit during respiratory infections.
How Yarrow Is Used
The most common forms are tea, tincture, and topical preparations. For internal use, the traditional dose is roughly 4.5 grams of dried herb per day, often split across two or three cups of tea. There are no large clinical studies validating this specific dose, and at least one case report documented side effects (dry mouth, blurred vision, and other signs of excessive nervous system stimulation) from drinking five cups of yarrow tea daily for a week. The clinical trial showing cholesterol benefits used 500 mg per day in capsule form, which is a considerably smaller amount than traditional tea dosing.
For topical use, strong teas or diluted tinctures are applied as compresses to wounds, inflamed skin, or hemorrhoids. Essential oil preparations also exist but are more concentrated and require more caution with dosing.
Who Should Avoid Yarrow
Pregnant women should not take yarrow in any form due to its ability to stimulate uterine contractions. If you have an allergy to plants in the daisy family (which includes ragweed, chamomile, and chrysanthemums), you may also react to yarrow since it belongs to the same botanical family. People taking blood-thinning medications should be cautious, as yarrow’s effects on clotting could theoretically interact with those drugs. Because yarrow stimulates bile production, anyone with gallbladder obstruction or active gallstone disease should avoid it as well.