Doctor's Note

Be sure to check out all my other videos on vitamin D.

For more context, check out my associated blog posts: Vitamin D: Shedding some light on the new recommendationsPlant-Based Diets for Rheumatoid Arthritis; and Vitamin D from Mushrooms, Sun, or Supplements?.

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  • 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. Be sure to check out all the videos on vitamin D.

  • So 600 iu’s is the correct amount now?

    • Michael Greger M.D.

      That’s the official recommendation, but I recommend 2000. I will be laying out my reasoning in videos over the next few days–I hope you stay tuned David! See all my recommendations at:

    • I’ve been taking 5,000 IU/day for years and regularly testing my serum levels, which are in the optimal range according to the Vitamin D Council (, but different people may require different amounts based on lifestyle and genetics. Best would be do do some genetic testing and test along the regimen change to optimize the intake. Of course, all this depends on external factors like the season of the year and others. Anyway, you can’t really overdose with 2,000-5,000 IU. Even if you by mistake take it twice a day, you’ll be more than fine, again, according to the Vitamin D council, which says toxicity would be between 10,000-30,000 IU/day for 3 months or 300,000 IU in 24 hrs.

      • stephanie

        I take 10,000 a day and my levels are good (43). A colleague of mine has been taking 20,000 a day for 3 years now and his levels stay at 62.

  • I noticed that you will cover more Vitamin D in future videos. I hope one of them will talk about the difference between D2 and D3 and the recommended daily dosages for each type if taken as supplements.


    • Michael Greger M.D.

      Such a good question. Taken daily in doses under 2000IU, vitamin D2 (ergocalciferol) and D3 (cholecalciferol) appear bioequivalent (meaning they both work just as well in your body). However if your physician suggests you take large intermittent doses (such as 50,000IU weekly, then D3 is probably superior).

  • I could have sworn I watched a previous video by you that recommended 2000 iu’s per day. Am I mistaken?

    • Michael Greger M.D.

      Yes, please see my answer above. Thanks for paying such close attention!

  • The BglLvr

    Can one consume too much vitamin D (i.e.,taking a vit D supplement and a calcium supplement with additional vit D)?

    • Michael Greger M.D.

      Yes, absolutely. The Institute of Medicine pegs the upper daily limit at 4,000 IU a day and the Endocrine Society says up to 10,000 IU is safe but given that Vitamin D and Mortality May be a U-Shaped Curve I would suggest sticking with 2000 IU unless testing suggests that is insufficient.

      • Mikee

        DR MG, I read somewhere that if someone is exposed to summer sun at noon time (11:00AM to 2:00PM) for 1/2 hour, he/she can easily get 10,000 IU all at once. Is it true? I do that all the time during the summer. So does that mean I am overdosed with Vitamin D?

  • Michael Greger M.D.

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

  • mark

    would 200ul of vitamin d be safe in a carbonated beverage

    • mark


    • mark

      thanks Michael prime + is all most finished 4 flavors
      lemon, lime
      all have vitamin and calcium carbonate
      I will send you a sample mark

    • mark

      thanks Michael I will be introducing this product soon
      prime + 4 flavors
      lemon, lime
      and blackberry
      all contain vitamin d & calcium carbonate

    • Susan

      Carbonated beverages are strongly linked to osteoporosis –fragility of bones. Two hundred I.U. of vitamin D is way too low. Most physicians recommend 2,000 I.U. in two doses after a full meal, like breakfast and dinner. Fat in your diet help with the absorption of vitamin D, something I did not know decades ago. Fat can be a handful of seeds or nuts.

    • Susan

      Carbonated beverages are not safe as studies now testify.
      I consume 1,000 IU in two servings twice a day with purified water and eat seeds or nuts for added fat to help the vitamin D adsorb into my blood stream.

  • julia

    Hi, I have breast cancer and bone metaseses . I was taking 2,000 a day but my vit d was high-94 ng. my dr said to lower it. I hear there are differing opinions on what is too high. What do you think? Right now I am doing it every other night but will probably buy 1,000 mg next time.

    • Alan

      The Life Extension Foundation recommends your Vit. D level to be between 50-100ng. They also recommend you take your supplement in the middle of your meal that contains the highest amount of fat. They recommend to have your levels checked from time to time.

  • Susan

    Before I was diagnosed with osteoporosis, I began supplementing with Multi-Minerals and vitamins, including vitamin D. At that time, the levels were only 400 I.U. per day. This was prior to 2006, and I swam 1.5 miles a day outside, as well as walked my dog 2 miles a day. I was getting vitamin D from the sun.

    After she passed away with bone cancer, I stopped walking. It was mentally painful to walk alone without her. A combination of not walking, and not getting much vitamin D, is perhaps part of the reason I was diagnosed with osteoporosis in 2006 after fracturing my hip. Now my PT was at an indoor walking pool, rather than in the sun.

    When I started fracturing my spine in 2012, I was unable to heal and had my vitamin D level checked. The physician told me it was so low that I should take 2,000 per day in two doses immediately. Amazingly, my bones began to heal. As we are on computers for longer hours and working inside, we do not obtain the minimal amount of sunshine on bare skin that we once did years earlier. This no doubt affected the vitamin D levels of numerous people worldwide. But, the medical community was slow to increase their recommendations.

    Now I eat my nuts just before taking my vitamin calcium and vitamin D supplements with meals, and my bones heal much faster than before. Of course, my diet is better too, thanks to the feedback from Dr. Greger, and other physicians here, and the knowledgeable people in this “chat room.” I thank you all!

  • Svetlana

    I bought vitamin D3 and per 1 tablet 85 µg. Can somebody answer how much IU in 85µg?

    • Susan

      1 µg = 40 IU. Do the math.

  • David

    Doctor reviews new research, says Vitamin D supplements generally not of benefit:

    Your thoughts? I know he is a big fan of yours.

  • wrae

    My chiropractor recommended 50,000 IU of D3 per week. I have been taking that for several months now. Is that okay?

  • minx

    I love you Michael Greger and all that you do. Thank you so so much, you are helping so many people. Earth angels like you we need.

  • Eric

    I currently take between 5000 and 10000 i.u.s a day.

  • Larry Woods

    After having an abnormally low vitamin D blood level, I took weekly OTC 50K units D3 for 3 months and brought my level up to 60. Can I keep taking the 50K weekly or biweekly instead of taking 2000 units daily?

  • Joe

    Many experts are saying the target blood serum range should be 50 – 60. They say that is the range for immune system boosting and cancer protection. It is interesting to me that the RDAs are thought of as minimum amounts for serious disease prevention like Rickets. Why not aim for the Optimum Daily Allowance! The RDA of Vitamin C is a measly 60mg per day!!!! It is dangerous to lead people to believe that 60mg / day is all they need to be optimally healthy. Dr Greger how about a video discussing the difference between RDAs and optimal amounts – I’d love to hear your opinion! Thanks for the video.

  • oceanfrontcabin

    what is current recommendation for optimum range of blood values for Vitamin D?

  • Teagen

    John McDougall just published an article through the Forks Over Knives site saying Vitamin D supplements are harmful, Has something changed?

    • Joseph Gonzales R.D.

      There will be many more vitamin D videos from Dr. Greger to come, so stay tuned…

      Here is Dr. Greger’s take on vitamin D. Perhaps there is more to vitamin D beyond bone health? Dr. Greger mentions if vitamin D supplements are necessary in this video and whether we should obtain vitamin D from sunshine, mushrooms or supplements here. You can also see his video on cancerous tanning beds.

  • tr

    Have you seen this article?

    they recommend 4000iu for pregnant women

  • Amit Bravo

    Doc, I supplemented myself with 2000IU per day 2 months back, my T level rise up the roof, muscles go solid like I am on some kind of steroid but it worsen my male pattern baldness, it speedup a lot , so I stopped it for a while, I really liked D, but I want to have some hair too.

  • Ena

    Are the recommendations of 2000IU the same for children and adults?