And if you overdose on copper, you can actually get toxicity from it
"Nicotinamide N-methyltransferase knockdown protects against diet-induced obesity." Nature, 508(7495), 258-262
Summary: Vitamin B12 injections for pernicious anaemia deliver hydroxocobalamin intramuscularly to bypass malabsorption caused by lack of intrinsic factor, rapidly correcting deficiency and preventing neurological damage
BPC-157 also appears on WADA's prohibited list
Peptides are instrumental in healing brain injuries, bone and ligament injuries or surgeries, gut issues, weight loss and body composition improvement, cognitive enhancement , anxiety and depression, and even sexual functioning among other uses