Most people use peptides in cycles, which means periods of use followed by breaks
Avoid other actives, retinoids, acids, vitamin C, during the GHK-CU introduction period
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As would be expected, the women produced higher levels of insulin and testosterone in response to the dose of sugar
Clinical Evidence in Humans The topical evidence base is unusually robust for a research peptide: Facial aging study (71 women, 12 weeks): A GHK-Cu facial cream documented increased skin density and thickness, reduced laxity, improved clarity, and reduced fine lines and depth of wrinkles (PMID 26236730)
10.1038/s44220-023-00145-6 232 KelmendiB.AdamsT