GHK Cu is the compound your body made at 25 and quietly stopped making. Most people find it in overpriced serums. Few understand what it actually does, or what happens when you're not GHK Cu Peptide The benefits, side effects, and more [2026] What are the dosing regimens and potential side effects of GHK Cu (Glycyl Histidyl Lysine Copper) peptides in various conditions, including wound healing and neurodegenerative diseases? NL GHK Cu (TETRAPEPTIDE + CU) Synthagen Synthagen PL