Where does B12 come from?
Besvaret 27. oktober 2026
B12 is found naturally in animal foods, but it is bacteria that make it. Plants do not contain B12 on their own, although some plant foods have it added, such as many breakfast cereals and nutritional yeasts. In adult ruminants, microbes in the rumen make the vitamin as the feed ferments.
Seaweed and algae sometimes contain B12 because B12-making microbes live on them, but the amount varies from batch to batch, so they are not a reliable source. The reliable sources are animal foods and properly fortified plant foods.
Vegetarians can get B12 from dairy and eggs, but the Danish food authority advises both vegans and vegetarians to take a daily supplement. For vegans the advice is 4 µg a day.
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