Vitamin C 500 mg Chewable Tablets - Juicy Orange Flavor Vitamin C is water-soluble vitamin that helps fight free radicals, which can lead to oxidative stress and the premature aging of cells. One of its primary functions is collagen formation, which is important for healthy skin and joints. Vitamin C also plays an essential role in the functioning of white blood cells, which are vital components of the immune system.* This formula is offered in a chewable dosage form, which contains only 1 gram of sugar per serving.