l glutathione for hyperpigmentation benefits skin: The truth about this antioxidant L-Glutathione Antioxidant Support | Allergy

10.1126/science.274.5284.99 99 HsuY.-H.HuangC.-F.LoC.-P.WangT.-L.TuM.-C

The GHK-Cu peptide occurs naturally in human plasma, saliva, and urine and has been synthesized for laboratory research applications

The eye area benefits from lower 1-2% concentrations, while normal facial skin can use 2-4%

This is the timeframe from the Finkley study (improved laxity, firmness, wrinkle depth) and the Carey/Pickart ultrasound study (28% average collagen density increase)

Glutathione helps regenerate the antioxidant potential of superoxide dismutase (SOD), alpha-lipoic acid and vitamins C and E, protecting the cell from a chain reaction that may cause damage to the cell

No disclosed concentration of the active peptide typically indicates a sub-therapeutic dose