Urinary Excretion of Vitamin B 12,folic Acid,and Citrovorum actor in Human Subjects on Various Diets. ∗

Abstract

Summary

The average urinary excretion of vit. B₁₂ in 14 subjects on normal diets was found to be 31 my per day. Similar values were obtained in 28 subjects maintained for 3 days on the following diets: milk, alkaline ash? low protein, and high protein. A somewhat higher value was found in 8 subjects on high purine diets, and the increase over normal was shown to be due to interfering compounds. On the third day of fasting, 6 subjects were found to excrete an average of 62 my vit. B₁₂ per day.

The average CF excretion by the subjects on the above diets accounts for only part of the total FA compounds excreted, and appears to be correlated with the total FA values. Differences in vitamin B₁₂ excretion resulting from dietary changes are not similar to those observed in CF and FA excretion.