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 long history of traditional use for alleviating menstrual cramps and other types of uterine spasms. The use of Viburnum for menstrual discomfort dates back to Native American medicinal practices and was later adopted into Western herbal medicine. Cramp bark and black haw have been used as antispasmodics, believed to relax smooth muscle, especially in the uterus, to diminish pain associated with menstruation.

Historically, herbalists have recommended decoctions or tinctures of the bark for painful periods (dysmenorrhea) and even to help prevent miscarriage due to uterine spasms. The active constituents are thought to include viburnin, coumarins, and various flavonoids, which may contribute to muscle-relaxant properties. However, robust clinical trials in humans are lacking. Most modern evidence consists of animal studies or in vitro research suggesting antispasmodic effects, but there is insufficient high-quality clinical data to fully validate traditional claims. The American Herbal Pharmacopoeia and other herbal monographs reference these uses, but generally note the lack of rigorous scientific studies.

In summary, the use of Viburnum for menstrual cramps is primarily justified by tradition, with some preclinical support for its mechanism, but limited direct scientific validation in humans.

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