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Ohio Experiment Station
Abstract
The apparent beneficial properties of direct sunlight have been known to man for generations. Fish and fish by-products have been used by European people for many years. Cod-liver oil had seen considerable use in human therapy in other countries prior to the discovery by McCollum and associates (1), in 1922, that cod-liver oil carried a calcifying factor (vitamin D) in addition to vitamin A. The therapeutic action of light in the prevention and cure of infantile rickets was first brought to our attention through the work of Huldschinsky, followed by the researches of Hess, Powers, and others (2), which indirectly suggested that light is closely associated with calcium and phosphorus metabolism.
Since the announcement of these findings, many reports have appeared which, indirectly through calcification studies, or more directly by means of metabolism or balance experiments, show that vitamin D or ultra-violet light are associated with calcium and phosphorus utilization.
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