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These products include hydroquinone, kojic acid, or vitamin C

NNMT is nicotinamide N-methyltransferase, an enzyme that uses a methyl donor to convert nicotinamide into 1-methylnicotinamide

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It is a: Humectant, drawing moisture into the skin Emollient, helping to soften skin Solvent, dispersing and stabilizing formulas Preservative booster, enhancing the antimicrobial activity of other preservatives This ingredient is a copper salt known for its wound healing properties

This lets you track the stability window from the moment of preparation, not the original manufacture date