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They found that glutathione protects skin cells from oxidative damage and premature ageing caused by UV and pollution

The glutamate residue is linked through its side-chain carboxyl, giving a gamma-glutamyl bond rather than a standard alpha-peptide bond, which is why the molecule resists most intracellular peptidases and is cleaved chiefly by gamma-glutamyl transpeptidase at the cell surface

Collagen is rich in the amino acid glutamine, which is known to support the integrity of the gut lining

A., Horner, J

Its pleiotropic mechanism of action serves to protect every cell, tissue, and organ in the eukaryotic body