Dietary supplements are able to exert a directed influence on the metabolism during physical exertion of a different nature. It is precisely such advantages of dietary supplements as high nutritional density, pronounced nutritional orientation, a variety of convenient forms of transportation and preparation, good taste and reliable hygienic qualities that allow them to be successfully used in catering for athletes of all sports:
• To increase the intensity of loads or in preparation for competitions;

• individualization of nutrition, especially in conditions of great neuro-emotional stress;

• urgent correction of unbalanced daily rations;

• increasing the frequency of nutrition in conditions of multiple workouts;

• reduce the environmental hazard of food.

The use of dietary supplements in everyday nutrition allows you to:

• quickly replenish the deficiency of essential nutrients, primarily micronutrients;

• purposefully change the metabolism of individual substances;

• increase the body’s resistance to the effects of adverse environmental factors;

• regulate and maintain the functions of individual organs and systems of the body in a non-drug way, thereby improving health and reducing morbidity;

• maximally individualize the nutrition of a particular healthy person according to gender, age, intensity of physical activity, his biorhythms, physiological state (for example, emotional stress), and also taking into account the environmental situation in the place of residence;

• enhance and accelerate the binding and removal of foreign and toxic substances from the body.

In addition, the use of such additives is an effective form of prevention of such widespread diseases in elite sports as immunodeficiency states. The domestic market offers a very wide selection of dietary supplements of all types. Although each product has a brief description and recommendations for use, in the practice of specialized nutrition, some general rules for the use of dietary supplements have been developed:
• The energy value of the daily diet and the content of proteins, fats, carbohydrates, vitamins and minerals in it are made up of food products and dietary supplements used;

• Including dietary supplements in the daily diet, it is necessary to switch to 4 or even 6 meals a day. Apart from other considerations, the point is also that due to the rapid assimilation of specialized products, they do not stay long in the stomach.

Since dietary supplements are used in nutrition to effectively cover the deficiency of energy and nutrients in the diet, the food form of a particular specialized product plays a significant role. Ceteris paribus, dietary supplements are most quickly absorbed by the body in the form of a drink. In team sports, they are simply necessary, because in the process of prolonged physical exertion / competition, the loss of many microelements from the body increases, primarily iron, copper, manganese, molybdenum, zinc (shown in observations of athletes) and macronutrients – potassium, magnesium calcite and sodium.
Such changes in metabolism lead to a decrease in the rate of recovery of energy and plastic resources in the body, which affects sports performance and hinders the growth of sports results. For example, a deficiency of macronutrients in the body and, in particular, in muscles leads to cramps, a decrease in the rate of contraction and relaxation. The lack of trace elements and essential vitamins significantly reduces the body’s immune defenses, which does not allow regular training, etc. The need to use dietary supplements (products of increased biological value) during training and competition is undeniable. This is convincingly confirmed by many years of research by specialists. The results obtained made it possible to clearly formulate specific conditions for the rational use of these food products in the nutrition of athletes. PPBC are used in the practice of sports to solve the following specific tasks:

• nutrition during long competitive loads and between workouts;

• acceleration of body recovery processes after trainings and competitions;

• regulation of water-salt metabolism and thermoregulation;

• adjustment of body weight (weight loss);

• targeted increase in the intensity of training during training for the development of the athlete’s muscle mass;

• reduction in the amount of daily rations during the competition;

• change in the qualitative orientation of the daily diet, depending on the orientation of the training areas.