Absorption of Cyanocobalamin, Coenzyme B₁₂, Methylcobalamin, and Hydroxocobalamin at Different Dose Levels

Abstract

The whole body retention of radioactive cyanocobalamin, coenzyme B12, methylcobalamin, and hydroxocobalamin was measured by whole body monitoring after oral doses of 1, 5 and 25 μg. At each dose level there were significant differences between the values for whole body retention of the different cobalamins.