Pickart stated that GHK-Cu has a favorable safety profile, highlighting that there is no indication that it causes side effects in test subjects [2]: The molecule is very safe and no issues have ever arisen during its use as a skin cosmetic or in human wound healing studies. In a 2018 review based on new genetic data, he reiterated that all biological actions associated with GHK appear to be health positive. He pointed to over four decades of GHK research encompassing cell, tissue, and animal studies, also noting the peptides inclusion in commercial anti-aging and cosmetic products such as creams, liposomes, and dermal patches [1]
Napolitano S, Woods M, Lee HM, De Falco V, Martini G, Della Corte CM, Martinelli E, Famiglietti V, Ciardiello D, Anderson A, Fowlkes NW, Villareal OE, Sorokin A, Kanikarla P, Coker O, Morris V, Altucci L, Tabernero J, Troiani T, Ciardiello F, Kopetz S
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Even so, a clear mechanism in the lab is not the same as proven results in people, and we will not promise an outcome the science has not established