Ghk Keratin Mask
GHK–Cu delivers copper to the hair surface, where—if cysteine thiolate sites are sufficiently available—copper can form Cu–S coordinationwith keratin. On damaged hair, this will drive surface-state effects (like improved smoothness, reduced roughness, and less frizz) by altering how the damaged keratin surface interacts with itself and with water/ions,
At pH 4.5, the environment is moderately acidic, which generally favors a higher fraction of cysteine in the protonated thiol