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It directly inhibits tyrosinase, the enzyme responsible for converting tyrosine into melanin, by binding to copper ions at the enzymes active site
That's intentional
Glutathione-associated enzymes in the human cell lines of the National Cancer Institute Drug Screening Program
Synergistic Ingredients: Glutathione works synergistically with other beneficial skincare ingredients such as vitamin C, retinol, tyrosinase inhibitors and niacinamide
Reconstitute it by total vial mass, then halve the result per peptide
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