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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.

If I took blood test #1 today, and then I started taking Vitamin D daily tomorrow, how much Vitamin D should I take, and how long would I have to take Vitamin D before I would do blood test #2, and see a change?

Ask the Vitamin D Council

Asked by  carrie48728600 on April 25, 2015


  • carrie48728600
     carrie48728600 on

    See title

    Answered by  carrie48728600 on

  • IAW
     IAW on

    Council recommends 5000iu a day of Vitamin D. This will get most average people of 150lbs to a blood level of 50ng/ml which is what the VDC recommends. I would say an “in general” retest would be about two to three months. If you are extremely low it may take a higher amount of Vitamin D to get you to that 50ng/ml level.

    Answered by  IAW on