Is Vitamin B12 vegan?
Yes — supplemental B12 is grown by bacteria, not taken from animals.
Also listed as: cyanocobalamin, methylcobalamin
Key facts
- Verdict
- Vegan
- Category
- Supplement
- Also listed as
- cyanocobalamin, methylcobalamin
- Best swap
- Cyanocobalamin tablets
Why
B12 is made by microorganisms. Ruminants can obtain it from microbes in their digestive tract when cobalt is available; other farmed animals may receive fortified feed. Fermentation-produced B12 provides a direct source without animal products.
What to check on the label
- Gelatin capsule shells
- Lactose as a tablet filler
- Dose: 2000 µg weekly or 50 µg daily
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What is actually in it
Vitamin B12 is the one supplement every vegan is told to take — and the good news is that the supplement itself is vegan. B12 is made only by bacteria and archaea; no plant or animal can synthesise it. Animals accumulate it from gut bacteria and contaminated feed (farmed animals are routinely supplemented themselves), which is how it ends up in meat, eggs and dairy. The supplement industry skips the animal entirely: commercial B12 is produced by fermenting bacteria such as Pseudomonas denitrificans in stainless-steel tanks, then purifying the cobalamin. The resulting cyanocobalamin or methylcobalamin is identical to the molecule in any animal product. The B12 ingredient is fermentation-derived, but the whole supplement or fortified food must still be checked for gelatin, lactose, milk, honey, animal-derived D3 and other ingredients. The practical guidance from vegan dietetic organisations: take a supplement of at least 10 µg daily or 2,000 µg weekly, or eat fortified foods two to three times a day supplying several micrograms each time. Cyanocobalamin is the best-studied, cheapest and most stable form; methylcobalamin is a valid alternative. Unfortified plant milks, seaweed, spirulina and fermented foods are not reliable sources — seaweed and spirulina contain B12 analogues that can even interfere with tests. Deficiency develops slowly (the liver stores years' worth) but causes irreversible nerve damage if missed, so supplementation is non-negotiable, cheap and simple.
Questions people ask
Can I get B12 from plants?
Not reliably. Supplement or fortified foods are essential on a vegan diet.
Which form is best?
Cyanocobalamin is the best-studied, most stable and cheapest.
Is B12 an animal product?
No — the vitamin is made by microorganisms, and commercial B12 is produced by fermentation. Check the complete supplement for gelatin, lactose and other animal-derived ingredients.
How much B12 should vegans take?
Common guidance: at least 10 µg daily, or 2,000 µg once a week, or fortified foods two to three times daily. Cyanocobalamin is the best-evidenced form.
Can I get B12 from seaweed or spirulina?
No — they contain B12 analogues that are not active in humans and can mask deficiency in blood tests. Rely on supplements or fortified foods.
Do non-vegans need B12 too?
Many do — absorption declines with age, and farmed animals are themselves supplemented. But for vegans supplementation is essential, not optional.
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