does ghk cu develop tolerance or lose effectiveness over time GHK-CU Making Skin Worse: Complete Troubleshooting Guide The Effect of the Human
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It details the peptides role in stimulating blood vessel and nerve outgrowth, increasing the synthesis of collagen, elastin, and glycosaminoglycans, and supporting dermal fibroblast function

10.1038/s41586-024-07516-8 11 CamilleC.Goff OcaneL.FrdricS.VasseurF.TanouM.NguyenC.et al (2021)

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Then, mice were subjected to a glucose tolerance test (2 g glucose/kg b.w