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Rapid Oxidation: Free glutathione quickly oxidizes into glutathione disulfide (GSSG) upon exposure to air or light, losing its efficacy and causing discoloration (browning) of the product
That lets you confirm the exact batch you are buying instead of trusting one site-wide figure
Mant CT, Chen Y, Yan Z, Popa TV, Kovacs JM, Mills JB, Tripet BP, Hodges RS
Citation: Verma R, Gupta R, Waghmare P, et al
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