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Another essential key role of glutathione for skin whitening is regulating melanin production by inhibiting the enzyme tyrosinase, which is involved in the synthesis of melanin, which may contribute to skin lightening

doi:10.1016/s0368-1319(68)80089-4

Providing a single recommended dose would misrepresent the scientific landscape

Make sure you discuss the ingredients that you wish to use in combination with the copper peptides

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GHK-Cu (glycyl-histidyl-lysine-copper) is the most widely studied copper peptide, reviewed in this paper