Vitamin K content of liver and feces from male rats fed diets containing butylated hydroxytoluene (BHT) was estimated by a chick bioassay method to investigate the mechanism of BHT-induced decreases in the activities of vitamin K-dependent clotting factors. The concentration of vitamin K in the liver of rats receiving BHT was reduced as compared to that of control rats. Conversely, the concentration of vitamin K in the feces from rats receiving BHT increased more than that from control rats. The vitamin K deficiency induced by BHT might be due to effects of BHT on absorption and excretion of vitamin K.
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