Effects of Vitamin B12 on Normal Thyroid Function in Rats. †

Abstract

Summary

Crystalline vit. B₁₂ was fed to immature rats of both sexes in order to determine whether the vitamin could alter thyroid function in normal or thyroprotein-treated rats. The growth rate of the rats supplemented with the vitamin was increased above that of the normal or thyroprotein-treated controls, but there was no significant effect on thyroid weight or uptake of I¹³¹. It is concluded that vit. B₁₂ does not alter normal thyroid activity in rats.