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One study had people on doses as high as 2,000 micrograms with no side effects Face Care Amount (mg):50mg GHK-Cu - 50MG https://media.springernature.com/m685/springer-static/image/art%3A10.1038%2Fs44259-025-00112-4/MediaObjects/44259_2025_112_Fig1_HTML.png

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