Hydroxocobalamin and Tiaminal B12 might need special prescriptions due to their unique properties
Vitamin B12 is water-soluble, meaning your body will excrete the excess intake through urine, so it's unlikely to cause harm even if you accidentally take a slightly higher dose
AOD 9604 is meant for subcutaneous injection, not intramuscular
"Stability of protein pharmaceuticals: an update." Pharmaceutical Research, 27(4), 544575
However, it does play a role in synthesizing other nutrients such as choline, creatine and melatonin, which all support healthy functions in the body
Vitamin B12, or cobalamin, is a unique, water-soluble nutrient your body can't produce