Dietary Supplement With Rosehips Timed Release Immune System SupportVitamin C, also referred to as ascorbic acid, is the single most commonly used vitamin supplement. It plays a major role in the formation of collagen (a structural protein in connective tissue), amino acid metabolism and hormone synthesis, and the utilization of many nutrients, such as folic acid and iron. It is also a key factor in the body"s immune system. This product provides a gradual release over a prolonged period of time.