or sports drinks, research supported by the dairy and nutrition council suggests that chocolate milk is more effective at replacing fluids lost through sweat and maintaining normal body fluid levels. athletes drinking chocolate milk following exercise-induced dehydration had fluid levels about 2 percent higher (on initial body mass) than those using other post-exercise recovery beverages. these results allowed for prolonged performance, especially in repeated bouts of exercise or training. performance-enhancing supplements in the extreme case of performance-enhancing supplements, athletes, particularly bodybuilders may choose to use illegal substances such as anabolic steroids. these compounds which are related to the hormone testosterone, can quickly build mass and strength, but have many adverse effects such as high blood pressure and negative gender specific effects. blood doping, another illegal ergogenic, was discovered in the 1940s when it was used by world war ii pilots. blood doping also known as blood transfusions, increases oxygen delivery to exercising tissues and has been demonstrated to improve performance in endurance sports, such as long-distance cycling. an assortment of supplements. the supplement creatine may be helpful for well-trained athletes to increase exercise performance and strength in relation with their dietary regimen. the substance glutamine, found in whey fiber supplements, is the most abundant free amino acid found in the human body. it is considered that glutamine may have a possible role in stimulated anabolic processes such as muscle glycogen and protein synthesis, for well-trained and well-nourished athletes. other popular studies done on supplements include androstenedione, chromium, and ephedra. the findings show that there are no substantial benefits from the extra intake of these supplements, yet higher health risks and costs.