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Find an Orthopedic Doctor in Your Area Sources The Lancet Healthy Longevity, 2 (9), e580-e592
Why long-term metformin can lower your B12 Metformin changes how your small intestine absorbs B12 from food
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The American Society of Health-System Pharmacists
Some clinical trials have used 1 mg per day , although higher doses do not necessarily produce better results
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