For topical use, which is how most people use copper peptides, measurable skin changes begin appearing around week 4 and are most clearly documented at 8 to 12 weeks of consistent daily application, based on available cosmetic human studies
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I., Huber, W
Research in skin cultures has suggested that GHK may stimulate the synthesis as well as the breaking down of collagen, glycosaminoglycans, and other components of the skins extracellular matrix like proteoglycans and chondroitin sulfate
CXC chemokines, including CXCL1, CXCL2, CXCL5, CXCL6, CXCL8, CXCL9, CXCL10, CXCL12, CXCL13, and CXCL16, have been identified with abnormal expression levels in synovial fluids, synovial tissues, fibroblasts, and endothelial cells of RA patients (94, 95)
It is a research compound and is not FDA-approved