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This report is essentially a confirmation, with some revisions, of the recommendations on vitamin standardization made by the first London conference in 1931. While the substances recommended as standards for vitamins A and C have been changed (to β-carotene for vitamin A and cevitamic acid [/-ascorbic acid] for vitamin C), the units formerly recommended for these vitamins have been retained and restated in terms of the newly chosen substances. The recommendations for standards and unitages of vitamins B1 and D remain unchanged. On account of the insufficiency of our present state of knowledge concerning them, the conference has not adopted standards or units for vitamins B2 (G) and E. The conference recognizes the desirability of expressing potency in terms of the exact amount of pure vitamin present but also recognizes the necessity, for the present, of estimating potency by means of biologic tests in comparison with a standard substance. It
Report of the Second International Conference on Vitamin Standardisation (London, June 12th to 14th, 1934). JAMA. 1935;104(23):2122. doi:10.1001/jama.1935.02760230070038