Vitamin C is a vital water-soluble vitamin, which is needed by a human body for a variety of metabolic functions. It is one of the most important nutrients required for treating common cold and cough. It is synthesized naturally in many animals but humans must consume vitamin C-rich meals to derive the vitamin-C. It is also utilized in repairing damaged tissues and for the production of crucial neurotransmitters. It plays a major role in appropriate functioning of the immune system. It is also utilized in the form of a cofactor for enzymes essential in the hydroxylation of lysine and proline to produce collagen. The lack of vitamin C can lead to decreased production of collagen that eventually results in the breakdown of body tissues, scaly skin, gingivitis, decreased wound healing, nosebleed, and decreased ability of the body to prevent infections. This book provides significant information to help develop a good understanding of vitamin C and its impact on human health. The topics in