European Vervain (Verbena officinalis) has a long history of traditional use in European folk medicine. Historical records and herbal texts from the Middle Ages and beyond document its application as a vulnerary, meaning a plant used to treat wounds and promote the healing of external injuries, including bleeding. Herbalists would often apply poultices or infused compresses of vervain to minor cuts, abrasions, and wounds to help staunch bleeding and speed recovery. The association with wound care is largely based on anecdotal reports and traditional herbal practice rather than systematic research.

However, there is little to no modern scientific evidence confirming the efficacy of vervain for stopping external bleeding. Studies on vervain have primarily focused on its potential anti-inflammatory, antispasmodic, and mild sedative properties, not on hemostatic (blood-staunching) effects. While the plant contains some astringent compounds (such as tannins) that could theoretically help constrict tissues and reduce bleeding, these effects have not been rigorously validated in clinical settings. Thus, the use of European vervain for treating external bleeding remains rooted in tradition, with minimal support from scientific research.