Distribution of Vitamin B12 in Natural Materials.

Abstract
The vit. B12 content of a number of natural materials as determined by the rat assay is presented. Fish solubles, streptomycin "slops," sheep rumen can-tents and glandular meats are excellent sources of vit. B12. Muscle tissue, eggs and milk products contain lesser antts., whereas plant materials show no measurable activity.
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