ghk cu itching Revitalize Your Skin: The Benefits of Copper Peptide for Youthful Glow GHK-Cu Full Body Hives/Itching :

Those stabilizing structures include: the floor of extensor carpi ulnaris (ECU) sheath, the ulnocarpal (UC) ligaments, TFCC especially its foveal insertion, the interosseous membrane especially the distal oblique band (IOM), the skeleton and joint congruency, as well as the dynamic muscle stabilizers (ECU, flexor carpi ulnaris FCU, and pronator quadratus - PQ)

The cartilage/chondrocyte data supports this

View source The New England Journal of Medicine 2021 PMID 33567185 Wilding JPH et al

That turns a molecule designed for pulsatile behavior (in and out over a few hours) into something circulating at potentially 1,000 times normal elevation for nearly a week