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To the Editor:—
I have just read the editorials in The Journal, March 16 and 23, entitled "Cod Liver Oil" (p. 926) and "Variations in Behavior of Vitamin D" (p. 1008). Each of these articles makes prominent reference to the recent publication from this laboratory, in which a physiologic difference between the vitamin D of cod liver oil and the vitamin D of bluefin tuna liver oil was demonstrated. Unfortunately, there is an error in each of these editorial interpretations, to which attention should be called.The first editorial states that "perhaps the most striking support for the peculiar efficacy of cod liver oil has been recently brought forward by Bills, Massengale and Imboden, who found that blue fin tuna liver oil with 40,000 units of vitamin D per gram was only one sixth as effective when assayed with chicks as was cod liver oil with only 100 units of
Bills CE. COD LIVER OIL. JAMA. 1935;104(15):1356. doi:10.1001/jama.1935.02760150068025
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