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Injection The injection is given into a large muscle (usually the upper arm or thigh)
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In the alkaline environment of the small intestine, R-proteins are degraded by pancreatic enzymes, freeing vitamin B 12 to bind to intrinsic factor (IF), a protein secreted by specialized cells in the stomach (parietal cells)
Why are B-12 injections preferred versus the over-the-counter supplement B-12
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