Clinical trials on skin have demonstrated improvements: In one study, GHK-Cu applied to photoaged skin for 12 weeks increased density and thickness while reducing laxity and wrinkles in 71 women
doi: 10.1136/gut.2010.216929 70
Today along with -carotene, ascorbic acid (vitamin C), -tocopherol (vitamin E) and flavonoids ., GSH - Glutathione, reduced form is commonly referred to as an antioxidant [17], which neutralizes free radicals due to the high electron-donating capacity of its sulfydryl (-SH) group, [13], and prevents damage to important cellular components, implicates in the cellular defense against xenobiotics
Thus, the crucial equilibrium between ROS production and antioxidant reserve is vital to ensure cellular redox homeostasis and general well-being [29]
USA: Lippincott Williams & Wilkins