oxidized glutathione buffer (GSSG) It favors its accumulation in the regions of high electron flux in cells where reactive species are generated. Oxidized glutathione | Sigma-Aldrich

Stanford, K

10.1016/j.imlet.2020.03.003 Immunol Lett

Typically, for the hair and scalp, GHK-Cu can take several months before one notices any significant difference in growth

This is in line with earlier findings that up-regulation of PR-1a is a reliable marker of the SA mediated defense pathway ( Earlier studies showed that the artificial elevation of endogenous GSH levels in virus-infected plant leaves by the application of the synthetic cysteine precursor OTC results in strongly attenuated disease symptoms and often also in decreased virus contents ( Figures 2 , 3 )

Think of it as a microscopic "magnet" that helps identify and neutralise free radicalsunstable molecules that can cause oxidative stress and damage to our cells