NAT-C Ester is a high strength vitamin C formula that is easy to consume and gentle on stomach. Vitamin C is a powerful anti-oxidant and helps boost immunity. When taken regularly, it decreases the duration and severity of common cold symptoms. Vitamin C is also necessary for collagen formation, tissue repair and as a strong antioxidant to prevent damage from harmful free radicals. The addition of bioflavonoids (plant-derived natural compounds) to vitamin C increase the absorption of vitamin C and enhance its action in the body.