Frontiers Exploring the beneficial effects of GHK Cu on an experimental model of colitis and the underlying mechanisms Organic Nitrate Therapy, Nitrate Tolerance, and Nitrate Induced Endothelial Dysfunction: Emphasis on Redox Biology and Oxidative Stress Andreas Daiber, Thomas Mnzel, 2015 Not too big. Not too small. Because of their intermediate size, macrocyclic peptides combine the potency and precise targeting of an antibody or biologic therapy with the stability and ease of administration of a Glycyl L histidyl L lysine Cu2+ (GHK Cu) Attenuates CuSO4 or LPS induced inflammation in Zebrafish larvae model ScienceDirect