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I'm trying to understand an issue with B-12 supplements. All of the ones I've looked at claim to be suitable for vegetarians. B-12 occurs naturally only in animal products. There is a compound similar to B-12 found in some plant products, but my understanding is that it is not a suitable replacement for real B-12.

When the label says it is suitable for vegetarians, does that mean it did not come from animal products? If so, could it be synthetically derived, identical to the animal B-12, and that would be suitable for vegetarians? Or does it mean it is the pseudo-b12 found in some vegetable products?

I looked out on the web and could not find an answer. All of the vegetarian websites I looked at mentioned the issue with B-12 coming only from animal sources, but they did not address the pseudo issue and how to tell if you've got the real thing. They seem to be more focused on the fact that people can go a very long time without B-12 and still survive. True, but that's not my question.

Anybody know how to tell when you have the real thing and not the pseudo thing?

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