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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)
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Glutathione may help address hyperpigmentation and uneven skin tone by inhibiting melanin synthesis, providing antioxidant protection, detoxifying and improving skin clarity, increasing skin brightness, supporting collagen production, and improving skin texture
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