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This is because B12 is essential for the production of red blood cells (RBCs)
Each injection should contain at least 5,000 mcg of pharmaceutical-grade methylcobalamin to be effective, and most patients notice improvements in energy, sleep, and mood within weeks of starting proper B12 therapy
Match it to the sequence rather than defaulting to water for everything
This is part of why B12 has a strong safety record, and it is also why levels sometimes need regular replenishment during active treatment
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