n-acetylcysteine or glutathione
https://incibeauty.com/photos/8/4/7/847a311af4638a6ca3ba2f61120c2b5c.jpg Packs:Pack of 2 Semin Cell Dev Biol 2011;22:619–23 Friendly Bacteria Probiotic Liquid Modulating skin colour: role of the thioredoxin and glutathione systems in regulating melanogenesis - PMC