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![ghk-cu mechanism of action tolerance desensitization Safety and Efficacy Approved and Unapproved Peptide Therapies for Musculoskeletal Injuries and Athletic Performance[v3] How GHK-Cu Tightens Loose Skin:](https://pubs.acs.org/cms/10.1021/acsami.4c18221/asset/images/medium/am4c18221_0002.gif)