* 10% Free * Dietary Supplement * Helps Neutralize Free Radicals and Supports a Healthy Immune System * 21st Century...for a Healthier Future Vitamin C is an important antioxidant nutrient that helps neutralize free radicals which may cause cellular damage in the body. Vitamin C also supports a healthy immune system. 21st Century"s prolonged release Vitamin C-500 provides long-term vitamin supplementation by slowly releasing nutrients to the body over an extended period of time.