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Glutamine is considered a conditionally essential amino acid because it becomes essential during times of stress and during the bodys natural healing process after strenuous exercise.* L-Citrulline The amino acid L-Citrulline has garnered significant attention for its benefit in optimizing physical performance
PMC 2878077
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Its defining structural feature is the gamma-glutamyl linkage: the glutamate residue is joined through its side-chain carboxyl rather than the usual alpha-peptide bond, which makes the molecule resistant to most intracellular peptidases and means it is cleaved almost exclusively by gamma-glutamyl transpeptidase at the outer cell surface (Zhang, Forman and Choi, Methods in Enzymology, 2005)
