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[7] The researchers reported that It was found the L-lysine residue plays the key role in these effects, because they were observed under the influence of L-lysine [introduction] in [concentrations] close to its equimolar content in the studied tripeptide. Similar studies have suggested the potential of the peptide to enhance levels of L-arginine, another analgesic amino acid

Expert Opin Drug Metab Toxicol 2010