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Olasupo Odunsi, MD, Medical Director Reviewed July 5, 2026 If you're constantly tired and your metabolism feels stuck, low B12 could be part of the problem

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When patients with hepatitis C were given standard therapy or standard therapy with a B12 injection of 5,000mcg, every 4 weeks for 48 weeks, those with the additional B12 responded better to treatment (18)

But blood levels of B12 mean little, and theyll rise regardless of therapeutic effectiveness

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