HGH Fragment 176–191 is a synthetic peptide derived from the C-terminal region of the full-length human growth hormone (HGH) molecule. It consists of the final 16 amino acids (positions 176 to 191) of the 191-residue HGH sequence. Its molecular formula is C₇₈H₁₂₅N₂₃O₂₃S₂, and it has a molar mass of approximately 1815.08 g/mol.