LAPCOS Glutathione Radiance Rescue Brightening Sheet Mask (Single) N ACETYLCYSTEINE (NAC) Glutathione film mask magic: feels like it's melting in, works fast 1h,but you can leave use it overnight, great daily for dry skin. If you want to try it , you can DID YOU KNOW NAC is a precursor to glutathione, the master antioxidant? This means it boosts your body's natural detox abilities, combats oxidative stress, and promotes overall immune health. Support your body