The Vitamin B12 Concentration in Liver Extracts and A Note on the Relationship Between Clinical Response and B12 Dosage

Abstract
Summary The vitamin B12 contents of a number of liver extracts have been reported. Assay results using Lactobaccillus lactis and L. leichmannii have been compared. The clinical responses to a number of extracts have been compared with their B12 contents, and the range of activity found by clinical test has been indicated.
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