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Does supplemental Vitamin D3 suppress endogenous melatonin production, hence it would be prudent to not take D3 later in the day or evening to avoid disruption to sleep? Some sources on the Internet make this assertion, but it does not seem to be universally held. My hunch is that sunlight or blue light (not D3) triggers the pineal gland to suppresses endogenous melatonin production, but some people have jumped to the conclusion that it is the D3 (the effect, not the cause) instead.

Asked by  Robert on April 20, 2015

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