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GHK-Cu, in particular, occurs naturally in the human body and has an excellent safety profile

If you start at full dose and develop a headache, you cannot tell if the peptide caused it or if you would have had that headache anyway

5.1 Search strategy Literature was systematically searched in databases including PubMed and international clinical trial registries (Controlled-Trials.com and ClinicalTrials.gov) from their inception through December 2025

Pergialiotis V, Tagkou NM, Tsimpiktsioglou A, Klavdianou O, Neonaki A, Trompoukis P

The primary mechanism involves the generation of reactive oxygen species (ROS), also known as free radicals