vitamin C

vitamin C Ascorbic acid, a water-soluble vitamin that is important in the synthesis of collagen, the framework protein for tissues of the body. Vitamin C is found in citrus fruits, tomatoes, berries, potatoes, and most vegetables. It may affect vitamin B12 absorption. Minor deficiency can cause gum bleeding, joint pain, nosebleeds, and easy bruising. Extreme deficiency can lead to scurvy, characterized by fragile capillaries, poor wound healing, and bone deformity in children. Overdose is not possible with this water-soluble vitamin, but overuse can cause diarrhea, painful urination, rash, and nausea. The daily adult requirement is 60 milligrams.