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Yarrow at a Glance
Achillea millefolium is an aromatic perennial in the Asteraceae family with finely divided leaves and flat clusters of small white or pinkish flowers.
Traditional Use
Yarrow has an extensive European and North American folk history involving minor wound care, digestive bitters, menstrual traditions and warm teas during feverish illnesses. These uses are historical and do not prove treatment of infection or bleeding disorders.
Research
Laboratory studies have examined flavonoids, sesquiterpene lactones and volatile compounds, but robust human clinical evidence is limited.
Preparation
Flowering aerial parts are used in tea, tincture and external preparations. Essential oil is much more concentrated than tea and can contain thujone depending on chemotype.
Safety
Asteraceae-family allergy is possible, especially in people sensitive to ragweed, chamomile or chrysanthemums. Pregnancy is generally avoided because of historical uterine and menstrual uses and inadequate safety data. Essential oil should not be casually ingested.
Folklore
Yarrow is strongly associated with protection, divination, love and the warrior Achilles in European folklore.
Bottom Line
Yarrow is a culturally important traditional herb with broad historical uses but limited modern clinical evidence. Allergy and pregnancy cautions matter. For educational purposes only.