What it is: A lightweight serum powered by 111SKIN's proprietary NAC Y² complex that future-proofs skin to help combat early signs of aging.Who it's for: Ideal for humid environments and for people with normal to oily skin.What it does: The serum is formulated by Dr. Yannis Alexandrides and powered by 111SKIN's proprietary Y² complex. It is an antioxidant-rich serum that delivers actives deep into the epidermis to plump, smooth and restore healthy skin. It is a lighter version of the Repair Seru