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Other types, like hydroxocobalamin, might be used for different reasons
Intramuscular B12 Injection Guidelines To get the most out of B12 therapy, knowing how to do intramuscular injections is key
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However, if there are neurological symptoms that have arisen due to B12 deficiency, they could take up to three months to improve, with mild improvements occurring in the first six weeks
Vitamin B12 shots work right away and your body will begin to manufacture new red blood cells as early as 48 hours so you will feel the effect in two or three days
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