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in skincare its brightening mechanism works differently from niacinamide or vitamin C it acts on the melanin synthesis switch itself, reducing tyrosinase activity and shifting eumelanin (dark brown-black pigment) production toward phaeomelanin (yellow-red pigment), resulting in a lighter, more even skin tone over time

It has a sulfhydryl (SH) group on the cysteinyl portion, which accounts for its strong electron-donating character

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This distinction is critical: the preserved formula allows repeated doses to be drawn from the same multi-dose vial without risk of contamination, provided proper aseptic technique is maintained