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A B12 injections effect can last anywhere from a couple of weeks to a few months, and the difference comes down to why you are deficient, how well your body holds on to B12, and the dose and schedule you are on

5-Amino-1MQ is typically prescribed as an oral capsule or a subcutaneous injection, depending on your goals and preferences

USA 94 , 1229712302 (1997)

A randomized placebo controlled trial of vitamin B12 supplementation to prevent cognitive decline in older diabetic people with borderline low serum vitamin B12

These products have been in the human diet for centuries

On the other hand, if you have no absorption issues and prefer the convenience of taking a supplement at home, oral B12 supplements could be the more practical choice