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Research Background & Scientific Interest GHK-Cu has accumulated one of the most extensive bodies of preclinical literature of any research peptide, with over five decades of published science across dermatology, oncology, neuroscience, pulmonology, and wound biology

The short answer, which the rest of this article unpacks in detail, is that the human skin-benefit data for GHK-Cu are overwhelmingly topical , while the GHK-Cu injectable form sold in the research-peptide market rests on mechanism, animal studies, and extrapolation rather than on controlled human cosmetic trials