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Ascorbic acid (Vitamin C) is a colorless, odorless, crystalline, water-soluble solid with an acidic taste. It is an organic acid, more precisely a vinyloge carboxylic acid; its salts are called ascorbates. Vitamin C is a water-soluble vitamin which the body cannot produce itself and which must therefore be ingested through food. It is found mainly in citrus fruits and fresh vegetables. Many processes in the human body require vitamin C. Ascorbic acid is available in four different stereoisomeric forms, but only L-(+)-ascorbic acid has biological activity.