Synopsis

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

Calcium has traditionally been used as a natural remedy to support sleep and manage insomnia. This use is primarily rooted in traditional beliefs rather than robust scientific validation. The rationale for calcium’s role in sleep centers on its involvement in the body’s production of melatonin, a hormone that regulates the sleep-wake cycle. Calcium helps the brain utilize the amino acid tryptophan to manufacture melatonin, which theoretically could promote better sleep. Some traditional and alternative medicine systems have recommended warm milk (which contains both calcium and tryptophan) as a bedtime beverage to aid sleep, and this advice has persisted for generations.

However, scientific evidence directly linking calcium supplementation to improved sleep or treatment of insomnia is limited. A few observational studies suggest that low calcium intake may be associated with sleep disturbances, and some small-scale studies indicate that correcting calcium deficiency can improve sleep quality. Nonetheless, there is a lack of well-designed, large-scale clinical trials demonstrating a clear, causal relationship between calcium supplementation and insomnia treatment. Most health authorities do not recognize calcium as a primary or proven treatment for insomnia. Therefore, while the traditional use of calcium for sleep is widespread, scientific validation remains weak, and the supporting evidence is rated as low.

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