By Michael Greger M.D. FACLM Many doctors mistakenly rely on serum B12 levels in the blood to test for vitamin B12 deficiency. …read more
Source: nutritionfacts.org
By Michael Greger M.D. FACLM Many doctors mistakenly rely on serum B12 levels in the blood to test for vitamin B12 deficiency. …read more
Source: nutritionfacts.org
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