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To the Editor:—Because of requests for further information concerning the vi-delta liquid concentrate (Lederle) used in the work described in the article entitled "Prevention of Dental Caries by Massive Doses of Vitamin D," by Drs. Béla Schick and Hermann Vollmer and me, which appeared in the December 1941 issue of the American Journal of Diseases of Children (page 1184), I wish to report that this preparation is a fish liver oil containing a mixture of several D vitamins, which may include vitamin D2 and vitamin D3, and that viosterol or synthetic vitamin D was not added.
BRODSKY RH. COMPOSITION OF VITAMIN D CONCENTRATE. Am J Dis Child. 1942;63(6):1148. doi:10.1001/archpedi.1942.02010060132012