Immune Health Supports Immune Health with Vitamin C & Bioflavonoids Powerful Antioxidant Formula Esterified Vitamin C Value Size Vegetarian Dietary Supplement Natrol Easy-C: A powerful combination of high potency Vitamin C and Citrus Bioflavonoid Complex support a healthy immune system and provide antioxidant protection. With easy-on-the-stomach esterified Vitamin C.