Description Improve immunity with lemon bioflavonoids and Vitamin C. Less acidic Vitamin C formula with lemon bioflavonoids. NAT C contains 1000 mg of vitamin C and the combination of lemon bioflavonoids, hesperidin and rutin. Moreover, it contains rosehip and acerola which are the natural sources of vitamin C. Bioflavonoids in combination with vitamin C helps to increase the absorption of Vitamin C in our body. In addition, NAT C helps to enhance immunity and strengthens blood capillaries.