Selenium
Selenium is a vital mineral with powerful antioxidant properties
It's worth noting that many nutrients play an important role in preventing physical stress in their way. Some of them may be familiar to you, while you are probably not aware of others. One of the most important micronutrient elements, which help to fight oxidative stress is selenium. 
NATURE OF SELENIUM
Selenium is one of the most vital micronutrient elements, which is part of the active centers of many proteins in the body. Selenium can be found in the body mainly in the form of selenoproteins. Selenoproteins are selenium-containing proteins, which provide the foundation for a huge number of functions necessary for maintaining health and productivity. These include muscle regeneration, the formation and normal functioning of cells, and the transport and storage of selenium.
THE ROLE OF SELENIUM IN THE HUMAN BODY
Oxidative stress occurs when the production of free radicals exceeds the natural antioxidant defense of the body. Active exposure to pollutants, toxins, and radiation, as well as constant stress, lack of sleep, and excessive usage of alcohol, tobacco, and refined sugar, can trigger such a dangerous thing as oxidative stress.
As you know, during the session of intense physical activity, the body starts the production of reactive oxygen species (free radicals), which also provoke oxidative stress. Antioxidant supplements are designed to reduce oxidative stress, promote recovery, and increase physical performance.
As independently, as well as in combination with vitamin E, various forms of selenium act as antioxidants, which prevent free radicals from damaging cells.