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However, these substances do not have B-12 biological activity for humans, a fact which may pose a theoretical danger to vegans and others on limited diets who do not ingest B-12 producing bacteria, but who nevertheless may show normal "B-12" levels in the standard immunoassay which has become the normal medical method for testing for B-12 deficiency

Before going on, I had a hormone test and my progesterone was scary low

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Med J Aust 1979;2:13

It's nature's way of helping the mushroom survive, and we benefit from this natural defense mechanism