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THE CHEMISTRY OF VITAMIN D
All efforts to prepare vitamin D in a pure state and to determine its composition, structure and chemical properties have so far met with failure. Nevertheless, a considerable amount of information concerning the nature of the vitamin has been obtained and it is possible that it may be isolated in a pure form some time in the near future.Four groups of investigators, one in the United States, one in England, one in Germany and one in Holland, are actively engaged in the study of this problem. The American group is composed of Bills and his associates of Mead Johnson & Co.; the English group of Bourdillon, Webster and others at the National Institute for Medical Research; the German group of Windaus and his associates at the University of Göttingen, supported by the I. G. Farbenindustrie and by E. Merck, commercial manufacturers of Vigantol; and
CLOUSE RC. VITAMIN D. JAMA. 1932;99(4):301–309. doi:10.1001/jama.1932.27410560004009
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