Doctor's Note

Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. This is the fifth video in a nine day series on vitamin D. Be sure to check out yesterday's video-of-the-dayVitamin D and mortality may be a U-shaped curve.

Also, check out my associated blog posts for additional context: Eating To Extend Our LifespanVitamin D: Shedding Some Light on the New Recommendations, and Vitamin D from Mushrooms, Sun, or Supplements? 

  • Michael Greger M.D.

    Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. This is the fifth video in a nine day series on vitamin D. Be sure to check out yesterday’s video-of-the-day Vitamin D and mortality may be a U-shaped curve.

    • http://www.facebook.com/ali.canani Ali Canani

      Hi Doctor,
      I noticed that since I started taking Vitamin D3 supplements, I feel really itchy all over. Could that be related to the D3 supplements? The onset is usually within an hour of taking it and it takes a few hours for me to stop itching. If it is related to the D3, what are the alternatives in winter?
      Thanks for your help.

  • http://www.ucl.ac.uk/cihd/staff/dibari filippodibari

    In some European countries, Vit D supplements prescription to adults over 70 years of age, with ostheoporosis, consists of monthly dosages of 25.000 IU (=820 IU/d considering 30.5 days/mo).

    IOM Upper Level is 4000 IU/d.

    Question: any study about the possible toxicity for such a large monthly dosages?

    NB: I recall similar questioning about Vit A mega doses in large national campaigns in developing countries in the last decade.

    I could not find anything so far on PubMed for Vit D.

    Thanks Dr Greger.

    Filippo

  • DrDons

    Hi filippodibari, I do not think a single monthly dose of 25,000 would lead to toxicity based on information at this time. Your concern is well placed though… since we have a history of making recommendations only having to change them after finding out about toxicities later.

  • vfayes

    Dr. Greger — have you heard about the new vitamin D3 spray? What is your opinion — helpful? Harmful? Waste of money? Thanks!

    • Michael Greger M.D.

      Based on their current pricing, supplementing with that product would cost hundreds of dollars a year. Given the fact that at the preferred daily dosing D2 and D3 appear to be equivalent, I would suggest choosing a less expensive option (D2 is easily 10 times cheaper). Just think about how much kale you could buy with all the money you save!

      • JG

        im guessing from the above comment that you feel D2 is just as effective as D3?  i’m vegan and recently found out im very deficient in D.  from what i’ve read, i got the impression that D3 is more absorbable and d2 could be toxic.  I would much rather take D2 b/c of my moral concerns..but i was scared into taking D3!  what is your opinion on this matter?  thanks so much in advance.

  • Michael Greger M.D.

    For some context, please check out my associated blog post Vitamin D: Shedding Some Light on the New Recommendations!

  • Lidia Varvari

    Dear Dr. Greger,

    Thank you for this interesting video!

    Could you provide us with a list of the best oils/butters to use as a sunscreen (including a range)?

    Thank you so much!