Complaints of severe fatigue led my PCP to run a Vitamind D 25-Hydroxy blood test. My level came back at 17ng/mL. She prescribed Vitamin D2 at 50,000 IU once a week. I understand that D2 is not what my body needs to correct my defiency but do they prescribe D3 is that does or can I only get it OTC? And can I switch from D2 or D3 or should I discuss that with my Dr first?

Asked by  jldavis7588654300 on August 19, 2015

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  • jldavis7588654300
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     jldavis7588654300 on

    See title

    Answered by  jldavis7588654300 on

  • IAW
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     IAW on

    If you live in the USA, I do not think there is “prescription” D3. There is only OTC and that is fine. D2 will not do you any good, humans need D3. Biotech does make a 50,000 iu D3 that you can take once a week. We here at the VDC like to promote taking D3 daily. So that would be 50,000 iu / 7 days = 7100 iu. That rounds to 7000iu a day. (Going to 8000iu will be OK too.) Doctors usually prescribe the 50,000 for about 8 weeks. After that you can probably go with a maintenance dosage of 5000iu per day. If you weigh more than average weight of 150lbs you may need to take more Vitamin D to reach a reasonable blood level. Here at the VDC we promote a blood level of 50ng/ml or slightly higher. The low end of the range 30ng/ml is not enough to keep you healthy. Please also read http://www.vitamindcouncil.org/about-vitamin-d/vitamin-d-and-other-vitamins-and-minerals/.

    Answered by  IAW on

  • IAW
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     IAW on

    PS You could give a copy of this blog to your doctor at some point if you like. https://www.vitamindcouncil.org/blog/meta-analysis-looks-at-efficacy-of-d2-vs-d3/

    Answered by  IAW on

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