vitamin b12 injections how much to take Cyanocobalamin (B12) Injection 1000 mcg/mL, Multiple Dose Vial 1 mL, 25/Tray B12 Injections - East Valley
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Researchers wanted to isolate just the fat-burning signal and AOD-9604 was the result

K.ParveenR.KandanS.JuluriS.et al (2017)

They are particularly beneficial for vegetarians and vegans (since B12 is found primarily in animal products), older adults with reduced absorption capacity, individuals with digestive conditions such as Crohn's disease or celiac disease, and anyone who has had gastric bypass surgery
Alternatively, alternate between abdomen and thigh

Then again, I'm a scientist, not a medic