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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.

How long before testing vitamin D levels should one stop vitamin D supplementation? I'm surprised to not be able to find the answer to this question anywhere on the internet. But maybe it's because it doesn't matter. I just know that for other kinds of nutrients/supplements, it's important to stop a few days beforehand for an accurate reading (or it usually shows much higher than what's really being retained), and I thought I would check. Thank you!

Ask the Vitamin D Council

Asked by  mara06 on January 21, 2015


  • mara06
     mara06 on

    See title

    Answered by  mara06 on

  • IAW
     IAW on

    I believe Dr. Cannel said do what you would normally do and then go get the test. Me, I like to not take it before I have the test that day and take the vitamin D after. Vitamin D is a cumulative thing so I really can’t see a big difference between taking and not taking that day before the test.

    Answered by  IAW on