fda approved glutathione iv High-Dose Add-On Glutathione IV for Skin Lightening:

N-acetylcysteine, or NAC, is a supplement that works in two ways: It provides cysteine, which is the rate-limiting amino acid for glutathione production It can also act as a direct antioxidant to scavenge ROS (NO2 and HOX)[ref][ref] The main antioxidant mechanism for NAC is by increasing glutathione levels

It may be helpful for patients with chronic injuries, digestive issues, or other conditions that havent responded well to standard treatments

As a person gets older, free radicals accumulate, which can cause changes to a persons skins elasticity, cellular activity, and other tissue changes

In ALT non-responders, glutathione treatment reduced triglyceride levels but increased FBS levels

2019 May 21;11(5):1125