Vitamin C (ascorbic acid) is a vitamin that the body needs to create blood vessels, cartilage, muscles and collagen in the bones. Vitamin C is necessary for your body's recovery process. Since your body does not produce vitamin C, you need to get it from your diet. Vitamin C is found in citrus fruits, berries, potatoes, tomatoes, peppers, cabbage, Brussels sprouts, broccoli, and spinach. Vitamin C is also available in oral supplements, usually in the form of chewable capsules and tablets.