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Information on the latest vitamin D news and research.

Find out more information on deficiency, supplementation, sun exposure, and how vitamin D relates to your health.

About Vitamin D

What is vitamin D?

  • What does vitamin D do and how does it work?

How do I get the vitamin D my body needs?

  • Learn from what sources you can get vitamin D and how much you can get.

Am I deficient in vitamin D?

  • Learn about symptoms, who’s at risk, and why many people are deficient in vitamin D.

Am I getting too much vitamin D?

  • Worried that you’ve taken too much? Check here and see if you have or not.

Testing for vitamin D

  • Learn about vitamin D testing and how you can get tested to see if you’re getting enough vitamin D.

Vitamin D and other vitamins and minerals

  • What other nutrients work with vitamin D?