Answer:

It is true that preliminary research suggests that a high dose of vitamin D can reduce the amount of melatonin naturally produced in the body. You can find details in the "Concerns and Cautions" section of the Vitamin D Supplements Review >>

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2 Comments

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george8442
February 15, 2016

Are there supplements to reduce prostate size? Thank you.

ConsumerLab.com
February 18, 2016

Hi George - We've now answered your question here: https://www.consumerlab.com/answers/_/prostate_supplements/

Margaret13982
May 3, 2017

Since Vitamin D can affect your melatonin, would it be better to take the vitamin D in the morning time?

ConsumerLab.com
May 4, 2017

As vitamin D is fat-soluble and stays for a while in your body, it shouldn't matter. However, it's best to take vitamin D with food containing oils, to enhance absorption. Also, the concern with interaction with melatonin relates only to high-dose vitamin D, as discussed in the Review.

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