Nature 584 , 279285 (2020)
GHK-Cu in particular is sensitive to heat, oxygen, pH drift, and microbial contamination each of which can break the peptide bond, dissociate the copper ion, or otherwise inactivate the molecule before it reaches your scalp
Using GHK-Cu has an advantage over using just GHK, since it alleviates copper deficiency without the risk of oxidative damage
That doesn't even sound like a thing
No cure still - but do keep trying to get your life into a better place, keep recording and you may eventually notice minor differences creeping in
casei [14] and Propionibacterium freudenreichii [49] are reported to have glutathione-S-transferase orthologs