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B12 is absorbed well from the fatty layer, so the vitamin reaches the bloodstream either way
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
Nerve damage happens when the provider places the needle incorrectly or at an inappropriate angle, causing numbness, tingling, or pain
1998 Oct;46(5):194-6
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