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Whether it's reversible depends on how soon it's diagnosed, I think. It can cause irreversible neurological damage, I've read, although I agree this probably isn't common (and it isn't necessarily...

The nutritional yeast flakes I buy contain B vitamins, but not B12. http://www.goodnessdirect.co.uk/cgi-local/frameset/detail/579698.html

Are you perhaps talking about a particular brand which has...

That sounds like an unpleasant conversation, Kaitlin. I wouldn't worry too much though.

I'll let other people answer the B12 questions and will just point out that there are a lot of people around...