iS Clinial C-15 Serum Advance+ uses hyaluronic acid and vitamin C to revive and replenish the complexion. Hyaluronic acid plumps the skin with intense hydration in order to diminish dehydration lines while increasing suppleness and radiance. Time released vitamin C (15%), maximized with copper tripeptide growth factor, boosts the production of collagen for a younger, smoother and firmer complexion. C-15 Serum Advance+ also helps to protect against UV damage and free radical damage, providing even more anti-aging benefits. The skin is left hydrated, smooth, plump and youthfully illuminated.