Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Yarrow (Achillea millefolium) has a long history of use in traditional herbal medicine, particularly for its purported benefits in supporting blood vessels and capillary health. Folk medicine traditions across Europe, Asia, and North America have employed yarrow to treat wounds, stop bleeding, and promote circulation. One of the primary ways yarrow has been used is as a styptic—an agent to stop bleeding from minor cuts—owing to its astringent properties and the presence of compounds such as tannins and flavonoids, which can cause blood vessels to contract and promote clotting. Historically, yarrow was also believed to strengthen fragile capillaries and was used internally for conditions involving excessive bleeding or bruising. However, while these traditional uses are well documented, scientific research specifically examining yarrow’s effects on capillary strength or integrity is limited. Some laboratory studies indicate that yarrow extracts possess anti-inflammatory and antioxidant activities, and its flavonoid content could theoretically benefit vascular health. But there is a lack of robust clinical trials directly linking yarrow to significant improvement in capillary function or prevention of capillary fragility in humans. Thus, its use for capillary support remains primarily rooted in tradition, with limited scientific validation at this time.

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