im b12 injection site Instruction Guide for Intramuscular (IM) Self-injection of Methylcobalamin 1mg/5mg How to Inject Vitamin B12
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Nature 540 (7634), 544551

However, in a world of plenty, this advantage would turn into a disadvantage and give fast increases in body weight, hyperinsulinemia, and the development of metabolic syndrome problems early on (reviewed by Dunger et al (48)

The study concluded that AOD 9604 did not produce any serious adverse effects, which is a promising sign for its stability and predictability in a research setting
So what is B12, and what can it do for you