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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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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 B12 supplements made of? Are they actually vegan? …
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