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where does the b12 injection go How to Give a Injection: Step-By-Step Instructions How to self-inject intramuscular vitamin
Description
It is still too early to consider IGF-1 as the key factor

Typically, the positive effects last from about a week up to a month, though this can vary based on how your body absorbs and utilizes the vitamin, as well as your overall health

B12 shots, also known as intramuscular injections of vitamin B12 (cyanocobalamin), are used to support neurological health, red blood cell production, and energy metabolism

Evidence for non-injectable routes is limited at best
