Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Calcium has some scientific support for its role in menstrual health, particularly in the context of menstrual irregularities and premenstrual syndrome (PMS). Several studies have shown that calcium supplementation can help alleviate certain symptoms associated with PMS, such as mood swings, water retention, and cramps, which often accompany menstrual irregularity. The proposed mechanism involves calcium's role in neuromuscular function and hormone regulation, as shifts in calcium levels may affect the menstrual cycle's regularity and symptom severity. Randomized controlled trials have found that women who receive calcium supplements report improved menstrual regularity and a reduction in PMS symptoms compared to those who do not supplement. For example, a 2017 meta-analysis in the journal Obstetrics & Gynecology Science found that calcium supplementation significantly improved PMS symptoms, some of which overlap with menstrual irregularity. However, while there is evidence supporting calcium's benefit in PMS and possibly in regulating cycles, the overall quality of evidence is moderate, with variability in study design and population size. Major guidelines do not universally recommend calcium as a standalone treatment for menstrual irregularity unless deficiency is present. In summary, while calcium supplementation may be beneficial for some women experiencing menstrual irregularity—especially those with low dietary calcium—the evidence is not strong enough to make it a first-line treatment, but its use is scientifically plausible and partially validated.

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