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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.

Do you know of any research done on the effect of timing of vitamin D supplementation and blood draw for vitamin D level? I'm beginning to wonder if we should not take the supplement at least on the day of a blood draw and maybe for longer. Could the supplement's recent addition to the circulation give falsely higher lab results?

Ask the Vitamin D Council

Asked by  Lynn on October 15, 2014

  • Jeff Nicklas
     Jeff Nicklas on


    When you get a blood test for your vitamin D status, it is important to continue your supplementation intake as regularly as possible.

    That is, if you are taking daily 5,000 IU capsules you should remain taking this amount up to and through your blood test.

    If you stop taking the supplement before the test or take more right before the test, then your results might not give you an accurate understanding of your levels.

    Answered by  Jeff Nicklas on