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How long after sun exposure does it take the body to produce vitamin D ? More generally- how long after a regular regime of daily sun exposure is started would a person expect to see vitamin D levels rise? Does the body create vitamin D in hours/days/ weeks after UVB exposure?

Asked by  keith.petroni56024400 on May 25, 2017

  •  keith.petroni56024400 on

    See title

    Answered by  keith.petroni56024400 on
  •  IAW on

    At https://en.wikipedia.org/wiki/Calcifediol it says
    “At a typical daily intake of vitamin D3, its full conversion to calcifediol(25OHD) takes approximately 7 days.[3]”
    I hope that is what you were looking for.

    Answered by  IAW on
    •  keith.petroni56024400 on

      thanks. Can you also address the same issue for the time frame for conversion of sunlight (UVB)to calcifediol(25OHD) – versus intake of a supplement? In other words- if i am out in the sun daily versus a supplement- how long for my calcifediol(25OHD) to increase?

      Answered by  keith.petroni56024400 on
    •  Amber Tovey on

      Hi Keith,

      It takes approximately 8 hours to convert 7-dehydrocholesterol into cholecalciferol (vitamin D3), according to this paper: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3897598/

      As Ivy mentioned, it takes about 7 days for cholecalciferol to be converted into vitamin D3.

      However, the Vitamin D Council recommends that people measure their vitamin D status two months after they begin supplementing or receiving regular sun exposure. At this time, your results should best reflect the level that you will maintain with your vitamin D/sun exposure regimen.


      Amber Tovey

      Answered by  Amber Tovey on

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