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Vitamin B12 deficiency anemia is due to an intrinsic factor deficit

There's also another concern: the labels on these vials say "for research purposes only" and "not approved for human consumption," shifting the liability from the seller to the purchaser

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Start slowly, monitor your skin's response, and back off if irritation develops

I think that what's still ringing in the back of my mind this entire conversation, even though I'm paying very careful attention, is that most of the drugs that are prescribed in this country are off-label