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The object of research is sunflower, high oleic sunflower and rapeseed oils, which are important in the production of food for people with increased physical activity. Such products should be balanced in component composition and enriched with biologically active substances, vitamins, antioxidants. Oils and fats are used as an important component of sport nutrition. Common oil is sunflower oil, which provides the diet with linoleic acid, as well as rapeseed oil, which enriches the products with linolenic acid. One of the most problematic places to use oils is oxidative damage, as this leads to the formation of hazardous compounds. During the study, the active oxygen method and the Oxitest device (Italy) were used. The first method allows to directly assess the content of oxidation products in the oil through the values of the peroxide value, the second method allows to measure oxygen consumption during oxidation processes in the oil. The oxidative stability of sunflower oil is studied using the active oxygen method and the oxidation method using the Oxitest device at a temperature of 110 °C. It is found that the induction periods determined by the two methods are close (2 hours 40 minutes and 2 hours 43 minutes, respectively). The regularity of reducing the induction period of sunflower oil with increasing temperature by the oxidation method on an Oxitest device is established. The temperatures of 90, 100 and 110 °C are used. A comparative study of the oxidative stability of sunflower, high oleic sunflower and rapeseed oils is carried out. Based on the obtained data, a comparative characteristic of the stability of research oils to oxidation is given and recommendations for their use in sports nutrition are given. The obtained data will allow to evaluate the effect of each of the experimental oils on the shelf life of the oil-containing product

An antioxidant complex has been developed for use in oils, fats, and food products, which must be enriched with biologically active substances of plant origin. Rational conditions have been examined for obtaining of water-ethanol extracts from plant raw materials: oak bark, eucalyptus leaves, and green tea leaves. An antioxidant has been derived capable of preventing the oxidation of fat-containing products, preserving their high nutritional value. The antioxidant substances of natural origin will make it possible to create products, balanced in composition, with prolonged shelf life while preserving the initial natural composition and the structure of components. In addition, the devised antioxidant is an additional source of substances that help the body fight free radicals, which form as a result of physical and mental stresses. The composition of antioxidants of plant origin includes antioxidant vitamins (tocopherol and ascorbic acid), plant phenols and thiol antioxidants (glutathione, lipoic acid), and microelements. These components are involved in the processes that inhibit oxidation. In addition, these antioxidants include selenium, zinc, folates, and other substances. Planning experimental studies for each type of a plant raw material in terms of the antioxidant activity of selected substances was based on a complete first order factor experiment. Synergistic effect of antioxidant substances has been established at a simultaneous use of extracts from oak bark, eucalyptus leaves, green tea leaves. The devised antioxidant prolongs the period of induction of a model substance (sunflower oil) by 2.7 times, whereas when using antioxidants from each type of plants the best indicator of the prolonged induction period was 1.9. Thus, the devised antioxidant could help preserve the quality and safety of fat-containing foodstuffs. The use of a given antioxidant may be proposed for food products for people who require additional antioxidants and biologically active substances in the diet. In particular, it is important for athletes