A study was made of the effect of sodium nitrate (3.1 and 0.3 g/l) on the metabolism kinetics and the biological effects of 14C-glucose (13 kBq/rat/day) that were chronically administered to rats. After both separate and combined administration of the radiation and chemical agents, no substantial changes were detected in the kinetics of metabolism and biological effect of 14C. Six months after the onset of the experiment, the reproductive function of the experimental rats was impaired.