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The presence of thiols in biological samples, such as glutathione, cysteine, and homocysteine, can react with the assay reagents

Sources NIH/PMC Randomized controlled trial of oral glutathione supplementation on body stores of glutathione NCBI Randomized clinical trial: long-term GSH supplementation in elderly type 2 diabetes Frontiers in Nutrition Glutathione: protection against oxidative stress, aging, and inflammation PMC Safety and efficacy of glutathione supplementation for skin lightening: narrative review Wiley Glutathione homeostasis and functions: potential targets for medical interventions Drugs.com What is glutathione used for

Use AM and/or PM

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The less tyrosinase is active, the less melanin is produced