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6 Clinical / topical cosmetic studies (PubMed)Topical copper-peptide trials for skin firmness, fine lines and photoaging the bulk of human GHK-Cu evidence

B) Profiles of the 24 hours continuous glucose monitoring for each treatment group In terms of secondary outcome measures and adverse events, the results of the study reported that all treatment groups experienced significant reductions in total cholesterol, triglycerides, LDL cholesterol, and VLDL cholesterol

doi:10.1038/s41467-017-00314-z Rastogi S, Joshi A, Sato N, et al

& Scott, J.D

The copper ion appears to stabilize and deliver GHK to cells

Even the review paper summarizing this study noted the results are not overly informative and reliable due to the lack of objective measures