“…The literature dealing with the development of irradiated ergosterol has been adequately reviewed in recent articles (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13). Steenbock (14,15) and Hess (16) in 1924 observed that certain foods, notably oils, milk, and cereals, can be made to possess antirachitic properties by exposure to ultraviolet light.…”