glutathione regenerates vitamin c and e Glutathione, Cysteine & Vitamin C and glutathione supplementation:

Many commercial "copper peptide" products actually contain Pal-GHK rather than GHK-Cu, but the two compounds have different physicochemical properties and may not behave identically in skin

Used as a shortcut bought off a sketchy website, it is a risk

In advanced delivery systems using ionic liquid microemulsion (CaT-ME), GHK-Cu drives hair follicles into early growth stages within 6 days compared to 8 days for standard GHK-Cu and 9 days for minoxidil, representing approximately 3-fold improved local delivery

This is not skin tightening in the surgical sense

JAMA Dermatol

Give hair three to six months before judging density, since hair needs time to grow above the scalp