H-Gly-Gly-Gly-OH, also known as Triglycine, is a tripeptide composed of three glycine amino acids linked by peptide bonds. It is commonly utilized as a model compound in studies of protein structure and function. Glycylglycylglycine may also act as a neurotransmitter in the central nervous system and has demonstrated antioxidant properties. Furthermore, it holds potential research significance in various diseases, such as cancer, diabetes, and neurodegenerative disorders.