Word: yolk
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Dates: during 1920-1929
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...through the California State Board of Health the influence of the mysterious Vitamin X which they now have renamed E. This vitamin stimulates reproduction in animals, prevents sterility. It is a complex organic compound, like the four other known vitamins,* and occurs in lettuce, wheat germs, alfalfa and egg yolk. Because humans eat largely of these foods, the discovery has little bearing on their habits...
...laboratories, containing vitamins A and B, they became fat, sleek and healthy, but practically all of them were sterile. When fresh green lettuce leaves were added to their menu, the sterile rats produced litters. Drs. Evans and Bishop found this X-substance also in the whole-wheat grain, egg yolk, beef liver and some other foods, but not in milk, the otherwise perfect food. The absence of Vitamin X affects the reproductive powers of the male, as well as the female rat. This vitamin can be extracted from the wheat embryo with ethyl alcohol and ether and a daily dose...