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[DOI] [PMC free article] [PubMed] [Google Scholar] 100.Buschmann JP, Berger K, Awad H, Clarner T, Beyer C, Kipp M

How GHK-Cu Compares to Retinoids, Vitamin C, and Other Anti-Aging Ingredients The 1998 head-to-head trial by Abdulghani measured procollagen synthesis side by side, and the copper-binding peptide outperformed both vitamin C and tretinoin

It is not the cheapest supplier in this comparison, but it publishes the broadest collection of testing documents

If you are on these medications, the providers can assess your risk and recommend appropriate supplementation