Vitamin B12 recommendation change

Vitamin B12 recommendation change

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DESCRIPTION: Based on two biomarkers of functional vitamin B12 (cobalamin) status, B12 recommendations formulated more than a half century ago may need to be updated. Have a question about this video? Leave it in the comment section at and I’ll try to answer it! This is the first of a five-part video series on B12, similar to the series I did on vitamin D ( where I delve into the derivation of my recommendations, found here for B12 ( and here in general ( To put vitamin B12 in context, please check out Vegan B12 Deficiency: Putting It into Perspective ( Tomorrow I’ll identify the safest sources of B12. If you can’t wait until tomorrow for your ( video-of-the-day fix, please feel free to check out videos on 1000+ other topics (
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  1. Homer Reynolds on January 28, 2023 at 3:31 am

    How much B12 should infants get? We have a 10 month-old son. My wife is still nursing him with breast milk and he gets prodominantly vegan blended food. However, my wife now wants to give him dairy, milk, eggs, and cheese, believing that he is lacking nutrition, B12 and protein. She agreed to a vegan diet before we had the child. She refuses to read any information supporting my position, instead reading only things that support her meat, dairy eating ways.

  2. fcfvv Gvfd on January 28, 2023 at 3:32 am

    I take 1mg methyl is that too high

  3. Same x2 on January 28, 2023 at 3:35 am

    Any info,or comment, from you regarding methylcobol 50 and folic acid as supplements to vegetarian/vegan diet and possible cause of lung cancer ?

  4. Maxim P on January 28, 2023 at 3:36 am

    01:18 Why for more than 7microgramms the graph goes up?? Doesn’t that show taking more than 7mcg worsen the effects?

  5. AK on January 28, 2023 at 3:38 am

    My B12 supplement says 2,000 mcg, is this too much or too little?

  6. Nick Eisnor on January 28, 2023 at 3:39 am

    Can my 6 and 9 year olds take the same b12 supplement as me?

  7. valnaples on January 28, 2023 at 3:39 am

    Anogoya, I hope you can meet Doc in person some time…he is a warm and beautiful guy who gives the *nicest* hugs! love him and all he does for us and our fur-friends too!

  8. manyasospapa on January 28, 2023 at 3:41 am

    4 to 7 mcg daily or 250 mcg daily? You said 250 in another video 🙁

  9. Mayliss C. on January 28, 2023 at 3:44 am

    I appreciate your work. I watch videos every morning. But, honestly, I believe that using racist slurs, twice, in your video is inappropriate and insensitive. Black people are watching and are supporting your work. I wonder if you would call mental ill patients, "débile” like they used to do in France back in the 19th century because it was the medical term used to describe these patients. I doubt it.

  10. Mazadaja Tyros on January 28, 2023 at 3:45 am

    I do not eat meet, dairy or eggs so I am thinking about eating one mackerel every weekend, I don’t like supplements.

  11. dot nothing on January 28, 2023 at 3:45 am

    Update: excess b12 has been associated with lung cancer in men. So take your b12, but don’t mega dose long term even tho this video told you there’s little/no risk in taking too much. With the passage of time and new evidence since this video’s production, we know more about this issue. "the long term use of high doses of B6 and B12 was associated with a two to four-fold increased risk of lung cancer compared to the risk of the disease in men and didn’t take the vitamins." This one study that concludes with a warning is not the final word, but it’s enough of a warning to stop people form taking mega doses of B long term. Probably don’t do that until there is some clarity on this cancer risk.

  12. Jessie Guerrero on January 28, 2023 at 3:47 am

    Could you do a follow up on this topic and the study published by the NLH which links high levels of vitamin b12 to a 15% increase in lung cancer?

  13. Radioinactivities on January 28, 2023 at 3:51 am

    0:19 Haven’t laughed so hard in months, thanks doc.

  14. Mazadaja Tyros on January 28, 2023 at 3:52 am

    Sorry, I found now that sardines are a little bit richer than mackerel.

  15. valnaples on January 28, 2023 at 3:52 am

    Mazadaja, yes, sardines are a bit richer AND they don’t come with much mercury since they are so low on the food chain, that’s the other good quality about them. I love the King Oscar double layer sardines in oil (I drain off all of the oil) with fresh lemon juice on Ryvita crackers. AND a green leafy salad to go with it.

  16. Mazadaja Tyros on January 28, 2023 at 3:53 am

    I think mackerel has the highest amount of B12 so by eating that kind of fish you need to eat less. 450g of mackerel = 85 mcg of B12
    With sardines is even more so I’m a bit worried how will I manage that. And you also get 85gr of proteins and over 70gr of fat. Clams would probably be the best, they are a b12 bomb!

  17. Edra Bogucki on January 28, 2023 at 3:54 am


  18. TAXok on January 28, 2023 at 3:55 am

    What do you think about eating insects for b12 ???

  19. valnaples on January 28, 2023 at 3:56 am

    Mazadaja, and *I* am thinking about eating a can of King Oscar sardines once a week to avoid the supps…just saying! I *hear* you!

  20. Egalitarian Vegan on January 28, 2023 at 4:04 am

    Love your channel. As a vegan, and whole foods advocate I think it is of the up most importance that we really drive home the importance of supplementing vitamin B12. This vital nutrient is essential for a healthy life. Deficiency of B12 can be disastrous, painful, and even cause death. Deficiency can ravage the body, and mind. B12 supplementation importance should never be taken lightly by meat eaters, vegetarians, and vegans. Science tells us that 40% of Americans are B12 deficient. That means, that the deficient majority are meat eaters.

    I would love to see a video campaign among YouTube’s vegan community to educate everyone about the importance of vitamin B12, and how meat eggs, and dairy are not the great sources everyone has been told because cooking destroys much of the B12 in those foods.

    Vitamin B12 is a product of bacteria that generally lives in healthy soils. It can be grown commercially similar to yeast. It is vegan.

  21. ME on January 28, 2023 at 4:07 am

    theory: (you are awesome)
    A) vegan homocysteine is beneficial "IF" enough plant antioxidants are present in the diet.
    B) vegan homocysteine levels are decreased by plant antioxidants "IF" enough plant antioxidants are present in the diet.

  22. zSofia Blaumann on January 28, 2023 at 4:09 am

    B12 in higher dosage seems to increase ACNE for me. Some might say, "that can’t be!!!" and you might be right, but until I find the underlining reason for why, after taking B12 in the recommended amount, I get pimples, I will still take it in the low dosage and experiment sometimes (when there is no life event where pictures are being taken)

  23. matchbox555 on January 28, 2023 at 4:10 am

    for those who don’t want to take a supplement and are concerned with animal rights, MUSSELS are a great source of B12 (also very low in cholesterol).

  24. Chaz Miller on January 28, 2023 at 4:12 am

    What form of B12 would you recommend?

  25. Stoudamire3 on January 28, 2023 at 4:12 am

    Bel video!

  26. Josh Mims on January 28, 2023 at 4:22 am

    you really couldve just said the study was done in 1958 and moved on😭

  27. nald rus on January 28, 2023 at 4:22 am

    cant catch up

  28. Jeong-hun Sin on January 28, 2023 at 4:22 am

    I suddenly realised that in other videos he kept emphasising how supplements DO NOT work and yet this B12, which can hardly be obtained from plants, conveniently works as a supplement. He said vitamin or mineral supplements did not work because "you cannot put nature into a pill", yet somehow this B12 alone, lack of which could make the vegetarian diet deadly, just works fine as a supplement?

  29. Anogoya Dagaati on January 28, 2023 at 4:23 am

    I love you Dr. Greger! You truly rocked my raw-food socks off with your presentations! You are fun to listen to and you are brilliant!

  30. Foto Posh on January 28, 2023 at 4:27 am

    If I dont eat b12, am i gonna die?

  31. Robin Hood was a socialist. on January 28, 2023 at 4:29 am

    I have nothing against veganism but if it is the panacea of disease and death defying diets as dr g states, why is it deficient in a necessary vitamin and requires a vegan to supplement with man made vitamins or insulin spiking cereal?