The Optimal Dose of Vitamin D Based on Natural Levels


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  • The question is NOT how much vitamin D you should take! (nutrients are consumed!!) The question should be how much vitamin D in the blood indicates healthy levels and IF IT DOES INDICATE at all !

    (to all the pills & sups addicts)

  • Dr. McDougall says 5 minutes per day in the sun is enough for a fair-skinned person. So is he a quack? I'm really wondering about the validity of his claims now

  • This is a video series on the site and today's video is suppose to go over whether it is preferable to get it from supplement or sun exposure, etc. this is #4 in a 6 part series i think. maybe wait until after tomorrows final post to figure out the recommendation?

  • I always wondered about the fact that we evolved without clothes, for the most part. And we currently live with clothes on while outside most of the time. I'm in Canada so in the Winter even the sun isn't powerful enough to give proper vitamin D if naked all day outside. I've been taking more vitamin D3 since this video series. I don't notice much of a difference, yet anyway. Maybe because I was never deficient.

  • Wait a second, this channel only has 176K subs? How can that be? I'm not vegan, not even vegetarian, and I believe the 100% free info here is close to invaluable. I gotta get on my friends and family to sub and watch.

  • Best solution in my opinion is to take the D3 supplements and get some sun exposure in the safe hours of the day but be mindful of the sun and cover up and stay in the shade for the rest of the time.

  • Too much conflict of interest in those studies. Do a research for yourself and you'll find out that authors who suggest serum levels > 75 nmol/L are biased.
    Some conflicts of interest: Bio-Tech Pharmacal, Pharmavite, Novartis, Diasorin, Vitamin D Council (San Luis Obispo, CA), UV Foundation (McLean, VA), Vitamin D Society (Canada) …

    I would rather suggest reading these studies:

    2014 – What is the optimal level of vitamin D?:
    "For patients at high risk of poor bone health or colorectal cancer, accepting the potential risks of higher 25(OH)D levels may be warranted to gain the possible benefits. This is a judgement call that physicians must make in consultation with an informed patient. Apart from these high risk groups, there is no strong evidence to support health benefits of vitamin D supplementation for those with apparent mild insufficiency (40–50 nmol/L) on routine testing."

    2014 – Observational studies vs RCTs:
    "Observational studies have identified links with several diseases, but these have either not been evaluated or not been replicated in randomised controlled trials. Randomised controlled trials for autoimmune and cancer related outcomes are clearly lacking. In addition, earlier evidence from randomised controlled trials that vitamin D supplementation (with or without calcium) increases bone mineral density and reduces the risk of fractures in older people is not seen in clinical trials that examine vitamin D only supplementation."

    2015 – Measuring vitamin D: ''A 25-hydroxyvitamin D threshold of at least 50 nmol/L at the end of winter is a suitable treatment target.''

    2015: Predictor of Health Outcome or Marker of Health Status?:
    "Finally, while our review focused on extraskeletal complications and discussed the related challenges, this debate might not remain limited to extraskeletal complications for long but may soon include skeletal complications. Indeed, recent evidence has suggested that vitamin D might not be as essential as previously thought for maintaining bone health and preventing falls [64–66, 124]. Vitamin D (the solar vitamin) is likely to remain a burning topic in coming years."

    2016 – Stokes and Lammert:
    "Currently, optimal serum vitamin D concentrations are controversial, and there is a discrepancy between two key guidelines. The Institute of Medicine recommends 20 ng/ml (50 nmol/l; 1 ng/ml = 0.40 nmol/l) as adequate on the basis of bone health studies, which is in contrast to the 30 ng/ml (75 nmol/l) urged by the US Endocrine Society [My comment: conflict of interest]. To achieve levels of the latter, approximately 4,000 IU of vitamin D would be required daily. However, the safety of such a dose needs to be confirmed in further controlled trials, as, for example, a higher risk of upper respiratory tract infections has been reported with 4,000 IU of vitamin D per day in asthma patients achieving circulating 25-hydroxyvitamin D levels of more than 30 ng/ml (75 nmol/l)."

    2016 – Global Consensus Recommendations on Prevention and Management of Nutritional Rickets (children):
    Sufficiency: >50 nmol/L

    2016 – Vitamin D and extra-skeletal health: causality or consequence:
    "Unless more evidence of clinically meaningful effects of supplementation is available, it may be too early to recommend for or against vitamin D supplementation for maintenance of extra-skeletal health and prevention of disease, beyond the daily requirements for calcium homeostasis and skeletal benefits."

  • What if the vitamin D levels should't be high, because we DO live in an unnatural state?

    What if the body expects there to be sun and other things which it does not have, if you provide it with vitamin D to signal natural sun exposure?

  • I think something we did over time has caused us to lose Vitamin D. Something about how we are living. My doctor said even folks who work outside for a living (her clients) have low Vitamin D levels.

  • TALK IN A LANGUAGE I UNDERSTAND. Talk mm, nothing else. You are confusing. . a common trait amohng the highly edumacated. K.I.S.Stupid… and you could have said this in 30 seconds

  • wuuow, did you just say evolved? . I was carefully listening to him, and he may be right about vitamin D. But if he believes we "evolved" he certainly didn't do his careful study and homework on that topic. Can't listen any further.

  • To what extent dose the increases in vaccinations impact this data ? How dose the US compare to other developed countries of the world ? Are there scientific trials and data that support vaccination policy for our children?

  • The Best Vitamin D3 Brand in Indian Market is Sunbless 60 K which is from Zydus Cadila Healthcare. This is with pre-emulsified form with Nano Technology advantage and is 4 times more effective then all other brands available in India.

  • When looking at evolution, our ancestors spent the entire day outdoors under the sun hunting & gathering, and that was how their skin made D. Most hunts were unsuccessful, and they resorted to succumbing to the contents of food that were gathered, which was plant material. Meat was a very rare delicacy for early primordial humans. Honestly, in the modern age, I'm glad I take a tablet of D with my store-bought plant foods. It saves a lot of time.

  • Aside from all the complexities of the D research, I continue to take a tablet of D daily because I don't get sick anymore. When I go on vacation, and I'm too lazy to take my daily D, I tend to get sick within 48 hours. My conclusion is not to stop taking D. I need to continue it no matter what.

  • My brother, who is a physician, keeps saying 15 minutes in the sun per day is plenty to get adequate D hormone. He is pretty stubborn & persistent on that 15 minute number. Well, I'm glad I have Dr. Greger to settle the argument.

  • Hey guys, just adding my two cents here.. for those who are thinking of getting their vitamin D from spending time in the sun, please note that in order for our bodies to absorb vitamin D our skin should not be dry and void of its natural oils, which means that if we go to the beach and swim and then lay in the sun, our skin probably is not oily enough to absorb sufficient amounts of the vitamin. Even if we swim AFTER laying in the sun, the water will just wash it off…the oil should remain on the skin for a few hours, for the skin to synthesize vitamin D over time.

  • Very informative and interesting. For all those confused, what I have been doing for the last 9 months that has changed my health dramatically is 16 min in a bathing suit every day around noon for sunshine (lay in a lounge chair and flip every 4 minutes). My vitamin D levels were stuck at 18 for over 5 years with progressively higher doses of D3 up to 5000 iU daily. What most doctors don't know is that for 15 min in the sun in a skimpy bathing suit your body can generate 25,000 IU of D, and this is what you need consistently if you have been deficient for a long time (which nearly all Americans are). If you live without the sun and your levels are below 30, you need to demand that your doctor educate themselves on the proper treatment of vitamin D deficiency and get on prescription dose vitamin D with regular blood monitoring until your levels get over 75. Sadly the vast majority of doctors are ignorant of the critical need of the body for Vitamin D and how to properly treat the deficiency…

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