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The limitation When it comes to skin lightening, other studies have proven that oral or topical glutathione only works for as long as you take it, and results may be inconsistent

Another study conducted the same year: Eye contour cream application on 41 women showed that GHK-Cu reduced wrinkles and increased skin density more than placebo and vitamin K creams

As a direct antioxidant, GSH quenches reactive oxygen species (ROS), reactive nitrogen species (RNS), and lipid peroxyl radicals, and regenerates oxidised vitamin E and vitamin C back to their active reduced forms placing GSH at the hub of the broader cellular antioxidant network

This blog is a comparison between collagen and glutathione