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 ascorbic acid

Form of vitamin C that has antioxidant properties (Sources: Advances in Experimental Medicine and Biology, 2002, number 505, pages 113–122; and Journal of Investigative Dermatology, February 2002, pages 372–379) and anticancer properties when taken orally (Source: Cancer Detection and Prevention, 2000, volume 24, number 6, pages 508–523). Ascorbic acid is difficult to stabilize in formulations (Source: International Journal of Pharmaceutics, October 1999, pages 233–241). Its acid component is a skin irritant.