Y Theorem Repair Light Serum NAC Y2: A lightweight alternative to the hero product that started 111SKIN — this serum packs all the punch of the original formula but with a lighter texture. Reduce Redness & Fine Lines: Containing NAC Y2, the formula provides skin with the optimum conditions for enhanced collagen production. Added illuminating agents help target discoloration. How to Use: Apply one pump morning and evening on clean, dry skin. Follow with a moisturizer. It is also excellent for use on scarring. NAC Y²: A complex that includes a trio of actives with superior antioxidant capabilities, one of which stimulates the production of Glutathione – the body’s most powerful intracellular antioxidant. 111SKIN: Skincare formulated to deliver a no filter confidence. 111SKIN is the leading global skincare brand that is surgically inspired, science led and drives clinical results.