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Met-Gly-Gly-Gly is a tetrapeptide composed of L-methionine and three glycine residues. L-methionine is an essential amino acid involved in protein synthesis, methylation reactions, and antioxidant defense through its role as a precursor to cysteine. Glycine contributes to various physiological functions, including neurotransmission and collagen formation. This peptide may offer combined benefits of methionine's role in metabolic processes and glycine's contributions to structural and functional health.