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Ala-Ala-Leu is a tripeptide composed of two L-alanine residues followed by L-leucine. L-alanine plays a role in energy production and muscle metabolism, while L-leucine is a key amino acid in promoting muscle protein synthesis and recovery. This combination of amino acids may support muscle repair, growth, and overall metabolic function, making it potentially useful for athletes or individuals involved in high-intensity physical activities.