glutathione smiles Glutathione, Licorice Extracts, Ethyl Ascorbic acid, Hyaluronic Acid and Nicotinamide Facewash Glutathione Skin Whitening: The Ultimate

(2007) demonstrated that both daily reaching training and transfer in an EE of rats increased neurogenesis in the dentate gyrus after focal cerebral infarctions

10.1038/s41574-018-0059-4 Nat Rev Endocrinol

Curious about the other peptides we covered

One study of 30 patients on nasal glutathione dosed at either 300mg or 600mg daily in three divided doses vs placebo over a three month period found significant improvement in UPDRS scores in the treatment arms over placebo while other measures of toxicity such as cell counts, liver enzymes, creatinine, blood urea nitrogen, and urinalysis were not significantly different between placebo and treatment groups

For those using injectable GHK-Cu rather than topical, the concern largely disappears