The Effect of the Human Peptide GHK on Gene Expression Relevant to Nervous System Function and Cognitive Decline 16. Receptor Regulation Principles of Pharmacology Study Guide The effect of GHK Cu tripeptide concentration on the properties of Download Scientific Diagram 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