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Oral or intramuscular administration of large amounts of vit. B12 was without effect on the blood of healthy adults and children. In particular, an eosinophilia was not observed. 2. Neither allergic nor toxic symptoms were noted during or after therapy. 3. It is concluded that vit. B12 is not the eosinophilic factor present in raw calves liver.
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Muehrcke et al. (1951) studied this question.
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