Natures Plus Immune Vitamin C Chewable 60. NaturesPlus Immune Vitamin C Chewable 500 mg is a delicious, citrus-flavoured chewable supported by synergistic bioflavonoids to improve activity, and further enhanced with acerola cherry. Enjoy the delicious and convenient power of all-natural immune system support, with the unique high-potency activity of NaturesPlus Immune Vitamin C 500 mg.. Vitamin C contributes to the protection of cells from oxidative stress, to the reduction of tiredness and fatigue, to normal energy-yielding metabolism and to the normal functioning of the nervous system.. HIGH POTENCY: 500 mg of Vitamin C. WITH COFACTORS: Includes bioflavonoids from citrus sinensis and citrus limon and sophora japonica flower bud