how long for vitamin b12 injection to work Injections vs Supplements: Which Is Better? How Long Does a B12

Gastroenterology 5 (142), 216

Certain populations need to inject B12 in larger doses to maintain baseline health: Individuals with pernicious anemia are initially injected with 100 mcg daily for one week, followed by 100 mcg every other day for 3-4 weeks

A course of injections is highly recommended for B12, for example a course of 4 every few weeks to begin with, moving forward it can be repeated once every few months to ensure regular levels are maintained.

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Delayed reactions, when they do occur, generally present within a few hours of the injection

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