Human Growth Hormone (HGH) is a peptide hormone composed of 191 amino acids, structurally identical to endogenous somatotropin. It has been investigated in preclinical and experimental research for its alleged roles in cellular growth, tissue regulation, and metabolic signaling pathways. These effects remain investigational and are not clinically established. HGH is a regulated substance, not an approved drug or dietary supplement, and is supplied for research use only. Not for human or veterinary consumption.