Experiments on Wistar rats showed that feeding a ration containing 0.1% concentrate of food indoles (indole-3-carbinole and ascorbigen) for 3 weeks increased activity of phases I and II xenobiotic metabolism enzymes in the liver and intestinal mucosa and weakened the toxic effects of trichothecene T-2 mycotoxin. Activity of the key enzymes of T-2 detoxification, microsomal carboxylesterase and UDP-glucuronosyl transferase, was 1.5-2-fold higher in rats receiving T-2 toxin against the background of indole-enriched diet compared to toxin-treated rats kept on standard ration.