The Upper Arm (Deltoid Muscle) The upper arm is one of the most common spots for B12 injections, and for good reason
However, it would appear this is the case only in one very specific circumstance: That is, when doctor-prescribed vitamin B-12 is administered to treat pernicious anemia (via Pernicious Anemia Relief)
If you become vitamin B12 deficient, it can affect your memory and cognition
GHK-Cu (sister peptide) given as repeated 2 mg injections into rat wound chambers modulated decorin/biglycan and increased type-I collagen and GAGs grounds the milligram-per-injection magnitude sometimes cited for the class, but this is GHK-Cu, rat, wound-healing
Studies show it can improve symptoms of neuropathy
Vitamin B12, aka cobalamin, is an essential nutrient that plays an important role in overall health