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NOW Glutathione Skin Brightener 30 Capsules

I would ask whether the proposed ingredient is specifically Copper Tripeptide-1, what commercial raw material is being used, what concentration or assay of Copper Tripeptide-1 exists in that material, what percentage of the raw material is added to the batch, and what Meisheng means when a listing describes a formula as “5% GHK-Cu.” I would request the corresponding raw-material specification or COA so that the formulation can be compared on the same basis as offers from other manufacturers

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In view of reported problems with batch-wise assays of nitrite and nitrate [40], we suspect the lower values (0.4 µM) are the more reliable