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"In 9 hours, 134 nanomoles of peptide and 705 nanomoles of copper permeated through microneedle-treated human skin, while almost no peptide or copper permeated through intact skin." That is the Li et al
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Who GHK-Cu Is For and Who Should Avoid It GHK-Cu is most often discussed by adults exploring skin-quality, hair-quality, or tissue-repair research, especially in the context of age-related collagen decline
However, for deep pigmentation, such as melasma or darker skin tones, it is rarely enough by itself
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