Metabolic research peptides encompass compounds studied for their interactions with energy metabolism, adipose tissue regulation, and mitochondrial signaling pathways. This category currently includes HGH Fragment 176-191 and MOTS-C — two structurally distinct compounds with different mechanisms of action and research applications. HGH Fragment 176-191 is a stabilised analogue of the C-terminal fragment of human growth hormone, studied for its interactions with lipolytic signaling without the growth-promoting effects associated with full-length GH. MOTS-C is a mitochondria-derived peptide encoded within the 12S rRNA gene, representing a relatively recently characterised class of mitochondrial-derived peptides with emerging research interest in metabolic regulation. Both compounds are supplied as lyophilized powder for in vitro research use only, with independent third-party laboratory verification.