how fast is b12 injection absorbed Vitamin A Vitamin B12 a quick shot that gives your body vitamin B12 directly into the muscle. This helps your body absorb it faster than tablets. Vitamin B12 helps B12 Injections vs Pills: Richmond's

If youre otherwise healthy and do not have a genetic mutation like MTHFR, then cyanocobalamin is generally recommended

On the other hand, in some cases of SIBO, bacteria from the large intestines travel back into the small intestines

Do I need any special preparation

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Or it could be the result of other factors, including some potentially serious ones