Vitamin C, also known as ascorbic acid and L-ascorbic acid, is a vitamin found in food and used as a dietary supplement. As a supplement it is used to treat and prevent scurvy.[1] Evidence does not support use in the general population for the prevention of the common cold.[2][3] It may be taken by mouth or by injection.[1]

It is generally well tolerated.[1] Large doses may cause gastrointestinal discomfort, headache, trouble sleeping, and flushing of the skin.[1][3] Normal doses are safe during pregnancy.[4] Vitamin C is an essential nutrient involved in the repair of tissue.[1] Foods that contain vitamin C include citrus fruit, tomatoes, red peppers, and potatoes.[2]