Antioxidant serums often feature a variety of powerful ingredients that protect the skin from free radicals and environmental damage. Some of the most popular active ingredients commonly found in these serums are: vitamin C (L-Ascorbic Acid), Vitamin E (Tocopherol), Ferulic Acid, Green Tea Extract (EGCG), Reservatrol, Niacinamide (Vitamin B3), Coenzyme Q10 (Ubiquinone), Polyphenols.