Synopsis

Source of validity: Traditional
Rating (out of 5): 1

Blessed thistle (Cnicus benedictus) has a history of use in traditional herbal medicine, particularly in European and North American folk remedies. It has been regarded primarily as a galactagogue (to promote breast milk production) and as a general tonic for women’s health. In the context of amenorrhea (absence of menstruation), its use is based on traditional herbalist practices rather than robust scientific evidence. Historically, herbalists included blessed thistle in formulas intended to “stimulate blood flow” or to “balance female hormones,” though these claims have not been substantiated by clinical trials.

There is no credible scientific validation that blessed thistle has a direct effect on menstrual cycles or hormonal regulation. The herb’s bitter principles (such as cnicin) are thought to stimulate digestive function and appetite, but there is no known mechanism by which it would specifically address amenorrhea. Contemporary herbal references sometimes list blessed thistle as a mild emmenagogue (an agent thought to stimulate menstruation), but supporting evidence is anecdotal or theoretical and not grounded in controlled studies.

In summary, the use of blessed thistle for amenorrhea is based in traditional herbal practice rather than evidence-based medicine. There is little to no scientific backing for its effectiveness in treating or supporting amenorrhea, and its use for this condition should be considered speculative.

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