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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.

Hello, recently my husband came back from his doctor with a prescription for Vitamin D3 50,000 IU (I am actually looking at the bottle he got which is manufactured by Bio Tech). The prescription is to take 2 capsule TWICE A WEEK (so 200,000 IU's of D3 a week), for a month and then 1 capsule twice a week after that. His vitamin D was 28. Knowing only enough about Vitamin D to get myself in trouble, I'm worried that this is an extremely high dosage. I called our pharmacist and he said he has never seen a prescription that high. Are there dosage warnings for Vitamin D3 at 200,000 IU's a week? Thank you so much for any information you can give me.

Ask the Vitamin D Council

Asked by  mrsvenice85140900 on May 16, 2016


  • mrsvenice85140900
     mrsvenice85140900 on

    See title

    Answered by  mrsvenice85140900 on

  • IAW
     IAW on

    Unless your husband has a severe condition or disease or is very overweight, then yes it is probably too high of an amount.( Please advise me if any of that is the case!) The whole thing would make more sense to me if it was Biotech’s 5000 iu’s. So please double check again on the amount in each capsule. (Maybe the doctor thought he bought 5000 iu’s and has not realized the error?)
    Now you said his level was 28 but I have to know how that was measured either in ng/ml or nmol/l because it makes a BIG difference?
    If it was measured as 28ng/ml and he is of the average weight around 150lbs,then he really should be taking 5000 iu a day. Taking that amount he should reach the healthy level of 50ng/ml that we recommend. So another blood test would be in order in a month or two to confirm that happened. If it does not happen then he would have to take more.
    If it was measured as 28nmol/l (that is 11 measured as ng/ml), then he is very deficient. Under those circumstances most doctors prescribe 50,000 iu ONCE a week. This translates to about 7-8000 iu a day. For future reference, It is better for you to take a smaller amount everyday rather than large amounts once a week or once a month but he can take the 50,000iu once a week. Again a recheck in about at least two months to make sure he is making progress or now has a level of 50ng/ml (125nmol/l) Once he goes to a lower maintenance dosage, then he should try and take it daily.
    Some one should read http://www.vitamindcouncil.org/about-vitamin-d/vitamin-d-and-other-vitamins-and-minerals/ . It is very important. If you do not have enough MAGNESIUM in your diet the Vitamin D will probably cause symptoms.
    Did the doctor prescribe ANY CALCIUM to be taken with the Vitamin D?? If he is going to take any amount over 5000 iu a day or the 50,000iu once a week it could give him hypocalcemia. If he gets any symptoms you should come back and tell me but if calcium levels go too low, it can be life threatening
    If you have anymore questions just ask!!!

    Answered by  IAW on