In stressful situations, as well as during the heavy, long-lasting and intense physical activity, the human body comes to the so-called. oxidative stress. It is a condition in which free radicals multiply - substances which are very reactive, anxious, agitated. And although they are desirable in some situations, their excess is causing serious damages regardless of the consequences. The body has an endogenous antioxidant defense system, but with the multiplying of free radicals it is insufficient. Thus introduction of supplementation becomes obligatory. First should come vitamin C, E and beta-carotene. Then you should invest in zinc, selenium, manganese, and iron. Q10, ALA, glutamine, lutein and Japanese mushrooms are the additional support.