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There are different formulations, each with unique benefits and purposes

This leads to poor B12 absorption, even in those who consume sufficient dietary sources[11]

A B12 shot is a quick intramuscular injection of vitamin B12 (cobalamin) that bypasses the stomach acid, liver metabolism, and intestinal absorption issues that limit oral B12 to roughly 1% bioavailability in most adults

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(1996) [Effect of vitamin B12 on sleep quality and performance of shift workers]