Studies on the occurrence of what has hitherto been called vitamin B have shown that this food factor is widely distributed in nature. It is found in most common foods of both plant and animal origin (Osborne and Mendel, 1 Sherman and Smith, 2 McCollum and Simmonds 3 and Sherman 4 ). Its distribution in animal tissues was investigated by Cooper, 5 who used the pigeon method and found that the liver and cardiac muscle of the ox were good sources of the antineuritic, water-soluble vitamin. Similarly, Osborne and Mendel, 5 using the growth of rats as the criterion for the presence of the water-soluble B-vitamin, reported that such tissues as the heart, liver, brain and kidney of the pig were rich in this food factor. The presence of vitamin B in hormone preparations, however, is not so well known. A review of the literature revealed a paucity of such observations. Eddy 7 demonstrated the presence of vitamin
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