Evidence supporting the use of: Blackhaw
For the health condition: PMS (general)

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Synopsis

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

Blackhaw (Viburnum prunifolium) has a long history of traditional use in North American herbal medicine, particularly among Indigenous peoples and early European settlers, for the management of gynecological complaints including premenstrual syndrome (PMS) symptoms such as cramping, irritability, and bloating. The bark of the plant has been used as an antispasmodic and uterine relaxant, which is believed to help alleviate menstrual cramps and dysmenorrhea—symptoms often associated with PMS. While these uses are well documented in ethnobotanical literature and early 20th-century herbal texts, there is limited modern scientific research to substantiate these claims specifically for PMS. Most available evidence consists of anecdotal reports and traditional practice rather than rigorous clinical trials. Some laboratory studies have identified antispasmodic and sedative constituents in Blackhaw, such as viburnin and salicin, which could plausibly affect uterine muscle contractions, but these data do not directly confirm efficacy for PMS in humans. Thus, Blackhaw's use for PMS is justified primarily by tradition, with a modest historical evidence base but minimal scientific validation at this time.

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