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vitamin A-deficient diet. The data indicate that no improvement in the results obtained in the usual biological assay for vitamin A was achieved by supplementing the basal diet with crystalline ascorbic acid. Somewhat different results might have been obtained, however, had the B-vitamins been furnished in the crystalline form, as in the studies of Mayer and Krehl ( J ) , instead of in the form of dried brewers' yeast, as in this study.doi:10.1126/science.108.2817.725 pmid:17752966 fatcat:6to35jo4jfeu7c3tav5ctzs4va