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Many protocols use them together for enhanced results
GHK-Cu (Glycyl-L-Histidyl-L-Lysine Copper) is a copper-binding tripeptide first isolated from human plasma, studied in preclinical models for its effects on gene expression, extracellular matrix remodeling, and oxidative-stress biology
It may also help reduce hair loss and improve hair thickness and density
6,1718 Cardiovascular symptoms , such as palpitations, tachycardia, and, very rarely, arrhythmias
(PubMed) Cederholm T, Palmblad J