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A widely referenced review reports that GHK-Cu raises growth factors such as VEGF and is associated with larger follicles and better hair-transplant survival, though its author has a commercial affiliation, so it should be read as a mechanistic review rather than clinical proof (Pickart, 2008, DOI)

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That distinction matters in a category where "copper peptide" is increasingly used as a marketing term rather than as proof of potency

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