- With 100 mg of BioflavonoidsVitamin C is an essential nutrient well known for its vital role in the immune system. It is a highly effective antioxidant that can protect the body's structures from oxidative damage generated during normal metabolism. Vitamin C is also necessary for the production of collagen and is therefore important for skin, bone, and joint health. This product includes Bioflavonoids, which work synergistically to support Vitamin C utilization.