GSH / Reduced Glutathione / Master Antioxidant
The body's most abundant endogenous antioxidant, produced in every cell. In skin, directly inhibits melanin synthesis — shifting from dark eumelanin toward lighter phaeomelanin. Also recycles oxidised Vitamin C back to its active form. Highly sought-after in brightening formulations. Levels decline with age and UV exposure.
This ingredient works across the 1% line depending on formulation. The higher end of the range should sit above the line; very gentle starter products may use the lower end legitimately.
Oral liposomal glutathione 500–1000mg/day for systemic brightening. Topical 0.5–2% in formulations. NAC supplementation is a reliable indirect approach.
Build a routine using Skin Stacker's free AI-powered tool — decode any product, check ingredient compatibility, and get a personalised AM/PM schedule.
Open Skin Stacker →