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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 does it take after sun exposure for the increased vitamin D to be reflected in the serum vitamin D level that is tested by your home test kit? Specifically- how fast does the body convert the sun exposure into vitamin D. thanks, Keith

Ask the Vitamin D Council

Asked by  keith.petroni56024400 on June 30, 2016

Answers
  •  keith.petroni56024400 on

    See title

    Answered by  keith.petroni56024400 on

  • IAW
    Participant
     IAW on

    Unless someone has a better answer the most I could find is that it “peaks at 7 days” and appears to me to convert . This comes from http://ajcn.nutrition.org/content/87/6/1738.long. See figure one. Looks to me like within 24 hours or less.

    Answered by  IAW on

  • bob.barr74324184100
    Participant
     bob.barr74324184100 on

    It peaks between 24-48 hours. I successfully brought my level up from 12 to 30 with just sun exposure. I am on the darker side and am afraid to get the amount of sun it would take to go higher than 30. I got monthly blood tests. The 24-48 hour mark is from research I’ve read and my own experience. I have extremely energetic reactions to vitamin D (sun or supplement). I always got my blood tests 1 full week after abstaining from sun, to ensure that I wasn’t measuring the post sun artificially high numbers. One time out of curiosity I got a test 2 days after a very good sun exposure session. At that point I was holding at 30 and couldn’t get it higher. But the 2 day later test showed 35! Next months test, after waiting a week, was back down to 30. So again, personal experience shows peak at 24-48 hours, plus some research papers I have saved on my computer.

    Answered by  bob.barr74324184100 on

  • bob.barr74324184100
    Participant
     bob.barr74324184100 on

    I apologize, I did not read your question properly. I do not use the home test kit. I use a proper lab. I have a lot of doctor friends and have no problem getting blood work for cheap whenever I want it (one even owns a pathology lab). Assuming the lab results are consistent with the home kit, then you should be able to rely on my answer.

    Answered by  bob.barr74324184100 on