The sun, pollution, smoking and other aspects of our lifestyles trigger the formation of free radicals. Free radicals cause oxidative stress to skin, accelerate premature skin aging and leave skin looking dull. Eucerin Hyaluron-Filler Vitamin C Booster with 10% pure and freshly-activated Vitamin C has been specially formulated to fight free radicals and address the first signs of aging: it strengthens skin, plumps up wrinkles and gives you a smoother, fresher and more radiant look.