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Can GHK-CU cause copper toxicity

But since youre already starting so high, you have more leeway to adjust other properties

Wiesmann T, Castori M, Malfait F, Wulf H
doi:10.1073/pnas.0510258103

Webster CD, Muzinic LA, Thompson KR

They produce excess eumelanin, which leads to dark spots, melasma, and an uneven skin tone
