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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)
Fourth, an important issue that is often raised is whether any GLP-1RAs can indeed penetrate the bloodbrain barrier and therefore express any neurobiological activity in the CNS, which would result in cognitive or behavioral changes
29 Epigenetic dysregulation further contributes to immune evasion and therapy resistance
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