Featuring a "Quad Focus" approach to combat visible aging, this global serum acts as skin's first line of protection to help combat visible aging. DEFEND: Works to defend skin from environmental aggressors. DETOX: Promotes natural cell removal, detoxing the skin of dead surface cells. REBUILD: Fortifies the skin's protective barrier to help inhibit future damage from occurring. REPAIR: Works around the clock to help promote skin's natural repair process and natural collagen production.