Synopsis

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

Viburnum species, particularly Viburnum opulus (commonly known as cramp bark) and Viburnum prunifolium (black haw), have a longstanding history of use in traditional herbal medicine to support the female reproductive system. Historical records and traditional herbalists have used these plants primarily to ease menstrual cramps, support uterine health, and help manage symptoms associated with menstruation and pregnancy, such as uterine muscle spasms and threatened miscarriage. The traditional use is rooted in the observation that these plants appear to have antispasmodic and muscle-relaxing effects, particularly on smooth muscle tissue like that of the uterus. However, scientific evidence supporting these claims remains limited. Most clinical evidence is anecdotal or comes from small, poorly controlled studies or animal models, which suggest a possible mechanism for muscle relaxation but do not definitively establish efficacy or safety. Despite this, cramp bark and black haw remain popular in herbal medicine for menstrual discomfort and related reproductive concerns, largely based on tradition and historical usage rather than robust scientific validation.

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