Synopsis

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

Cassia bark (Cinnamomum cassia), commonly referred to as Chinese cinnamon, has been used in traditional systems of medicine, particularly Traditional Chinese Medicine (TCM), to address menstrual irregularities and related gynecological conditions. In TCM, cassia bark is considered to have warming properties that help to invigorate the blood, dispel cold, and alleviate pain, which are thought to be underlying factors in menstrual irregularities such as amenorrhea (absence of menstruation) and dysmenorrhea (painful menstruation). Herbal formulas containing cassia bark, like Gui Zhi Fu Ling Wan, have been prescribed for centuries to regulate menstrual cycles and treat conditions involving blood stasis and cold in the uterus.

However, the scientific evidence supporting the efficacy of cassia bark for menstrual irregularity is limited. While some laboratory studies suggest that cassia bark may have anti-inflammatory, antispasmodic, and vasodilatory effects, which could theoretically benefit menstrual health, high-quality clinical trials in humans are lacking. Most available evidence is anecdotal or based on case reports and traditional use rather than rigorous modern research. As such, its use for menstrual irregularity is best characterized as being supported primarily by traditional, rather than scientific, evidence.

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