Questions tagged [b12]

B12 is an essential vitamin that has no reliable known plant sources, and must therefore be obtained from fortified food products and/or supplements in a vegan diet

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Vitamin B12 and recommended daily amount

Some vitamin B12 supplements provide unusually large dosages. For instance, one product suggests one tablet a day and it provides 16,667% of the daily amount. If I'm not mistaken, that's 160x what you ...
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Is Aloe a source for vitamin B12?

Can a vegetarian drink aloe juice to avoid B12 deficiency?
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Kombucha as a vitamin B12 source

Kombucha can have very high amounts of vitamin B12 (e.g. https://www.reddit.com/r/mildlyinteresting/comments/65wjep/this_kombucha_has_a_ridiculous_amount_of_b12/). Where does the vitamin B12 come from?...
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Is the growth medium used to cultivate vitamin B12-producing bacteria vegan?

Vitamin B12 or cobalamin is an essential nutrient that plays a vital role in human health. Because it is considered that active forms of B12 cannot be reliably obtained from plant foods or algae, the ...
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Does rejuvelac contain B12?

The issue of B-12 deficiency is of great concern for myself and others in the community. After switching to a vegan diet, I looked for alternative sources of cobalamin. Currently, I buy nutritional ...
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B12 deficiency in vegans [duplicate]

As far as we know, vegans need to supplement with B12 to prevent deficiency due to a higher risk of such. How long does it take for B12 deficiency to develop, if a vegan person does not take any B12? ...
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Do fermented foods from India like idli and dosa contain vitamin B12?

Do fermented foods from India like idli and dosa contain vitamin B12? Can eating these foods prevent vitamin B12 deficiency in vegetarian people?
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10 votes
3 answers
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Should vitamin B12 supplement be taken at a specific time of day?

I heard that vitamin B12 absorption can vary based on time of day and the most recent mealtime, and also that acid-reflux drugs might interfere with B12 absorption. What is the optimal time of day to ...
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Why do vegan doctors recommend B12 every day/week?

For example, Dr. Michael Greger (of NutritionFacts) recommends: For adults under age 65, the easiest way to get B12 is to take at least one 2,500 mcg supplement each week or a daily dose of 250 mcg....
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Do Methycobalamin Oral Supplements help raise B12 levels?

NutritionFacts.org says "...there is insufficient evidence to support the efficacy of the other forms of B, like methylcobalamin." I currently take 500 mcg Methycobalamin oral supplements every ...
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How common is it for the livestock industry to supplement B12?

In debates, the contra side often claims veganism can’t be good because vegans have to supplement B12 (appeal to nature), while the pro side sometimes claims that even carnists supplement B12 ...
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After how long will one see symptoms of lack of B12?

Suppose a person goes vegan and neither eats food items with B12 nor supplements, i.e., doesn't take vitamin B12 at all. After how much time will the symptoms be visible and after how much time will ...
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8 votes
3 answers
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What amount of vitamin B12 is required per day?

I read some questions in this site regarding B12. Some said 50 mcg was required per day, while some said 1000 mcg. While Vegan Society says 3 mcg per day atleast. What is the amount of B12 required ...
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7 votes
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Are there any studies of methylation status in case of proper B12 complementation in vegans/vegetarians?

I'm trying to look for scientific studies that study the impact of careful vegetarianism/veganism on DNA methylation at the locus level (meQTL study). The closest I could find was this one, that ...
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Any studies linking vitamin B12, melatonin, and sleep

Is there a study out there that links vitamin B12 specifically with lowered or raised melatonin? And related to that, is there any relation to high amounts of B12, and lack of sleep or other sleep ...
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What are the best sources of vitamin B12 for vegetarians?

What are the best sources of vitamin B12 for vegetarians? Can milk and yogurt make up an adequate daily intake?
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Do commercial chicken's eggs contain B12?

If chickens are fed with only treated grain, where do they obtain vitamin B12 from? Are these eggs a good source of vitamin B12?
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Can too much B12 be harmful?

While I know that B12 is water-soluble vitamin and (as I understand it) it should be naturally expelled from the body, is this really the case even with continuously high intakes, eg. 1000mcg/day for ...
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When taking B12 supplements, is it a viable strategy to take higher dose every few days as opposed to lower dose every day?

As a recently converted vegan, I first wanted to try out not taking B12 supplements to see if I can get the recommended RDA from fortified foods alone. This turned out to be rather hard and I average ...
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6 votes
1 answer
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Is there a daily limit for absorption of vitamin B12?

I am interested in knowing whether there is some biologically imposed limit for an amount of B12 that human body can absorb per day. If so, what happens with the rest of the consumed B12? Is it just ...
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10 votes
2 answers
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Is there a protocol to help vegetarians/vegan chose the right concentration for B12 supplements?

Following this question, I am wondering if there is a clear protocol/algorithm (I do not know the exact medical term) that a vegetarian/vegan can use to compute the recommended daily amount of B12 (...
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Different types of B12?

I've realized that there are different types of B12 supplements. Most of them are from Cyanocobalamin, but there are also from Methylcobalamin. Does anybody know the differences or what is the best ...
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Is Spirulina a good source of vitamin B12?

I've found mixed information online about using Spirulina as a source of vitamin B12 for humans when searching google for "Spiralina B12". For instance the first match states that Spirulina has a mix ...
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29 votes
3 answers
13k views

Where does the B12 in vitamin supplements come from?

I know that many animal products contain vitamin B12 and that it's very hard or even impossible to get enough from plant-based food. There are supplements which vegans should take. But what are these ...
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What is a good source of Vitamin B12 for a vegan?

My understanding is that Vitamin B12 is a vitamin that vegetarians and meat eaters get from animals and animal products; how can I obtain this vitamin as a vegan? Can I live without it safely?
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