Vitamin D deficiency affects many hormones and neurotransmitters in the brain. Melatonin production relies on vitamin D: Vitamin D helps the body produce melatonin, a hormone that supports sleep. Low levels of vitamin D results in low levels of melatonin, leading to sleep problems.

RDA: The Recommended Dietary Allowance for adults 19 years and older is 600 IU (15 mcg) daily for men and women, and for adults older than 70 years it is 800 IU (20 mcg) daily.


The effect of vitamin D on sleep quality: A systematic review and meta-analysis
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Vitamin D and Sleep Regulation: Is there a Role for Vitamin D?
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The Role of Vitamin D in Sleep Disorders of Children and Adolescents: A Systematic Review
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The effect of vitamin D supplement on the score and quality of sleep in 20-50 year-old people with sleep disorders compared with control group
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Vitamin D and sleep in children
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Low serum 25-hydroxyvitamin D concentrations in chronic insomnia patients and the association with poor treatment outcome at 2months
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The Association between Vitamin D Deficiency and Sleep Disorders: A Systematic Review and Meta-Analysis
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