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Leu-Gly-Gly-Gly is a tetrapeptide consisting of L-leucine and three glycine residues. L-leucine is a branched-chain amino acid critical for protein synthesis, muscle repair, and energy production. Glycine plays a role in various physiological processes, including neurotransmission and collagen synthesis. This peptide may support muscle recovery and overall metabolic functions, with L-leucine driving protein synthesis and glycine contributing to structural and functional roles in the body.