The work was carried out under a grant jointly with the Fund of Infrastructure and Educational Programs of RUSNANO Group "Nanotechnological methods of research of biogenic elements for optimizing the diets of farm animals and poultry"Summary This article reflects the results of an experiment to study the effect of an antistress additive on the digestibility and use of minerals in the diet by poultry of the egg cross Hisex Brown. The experiment was carried out on the basis of the research center for the safety and effectiveness of feed and additives. Studies have found that the best performance was observed in the birds of the experimental group, which, in addition to the main diet, were injected with the additive Feed-Food Magic Antistress Mix in an amount of 500 g per ton of compound feed.