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5mcg might not seem like a lot
Multiple studies in this and in other countries have found B12 deficiency in 10 percent to 24 percent of people 75 and older
Precautions General The validity of diagnostic vitamin B12 or folic acid blood assays could be compromised by medications, and this should be considered before relying on such tests for therapy
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Even high doses of biotin have not demonstrated toxic effects, so there is no strict upper limit for safety established in humans
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