The use of drug in sports is restricted because it increases the performance during sports. Due to the effect on performance, drugs are banned in sports and taking drug is called doping. Some doping substances, permitted in low doses: are alcohol and caffeine.

The testing procedures for drug abuse in sport are strict and at sometimes very unfair. They are very unfair because athletes are liable for knowing what is banned in spite of the fact that additions are made approximately daily to the list of banned substances.

International Olympic Committee has determined that drug tests will require verification, whenever possible, by gas chromatography and mass spectrometry, which describe numerous chemical features of an abused drug.

The International Olympic Committee, the leading body of the Olympic Games, issued its first list of substances prohibited for use by athletes in 1967. The drug testing of the athletes are started in 1968 in the Olympic Games. Most sport authorities also test for drugs in many sports. Now the testing in sports is complex and become constant change.

The drugs which are banned in sports or which provides maximum benefit in sports are Erythropoietin, Steroids, THG, Modafinil and Human Growth Hormone. These drugs are the key drugs in sports.

The historical evidence shows since the implementation of drug testing: athletes take drugs, organizations develop tests, athletes beat tests, organizations come out with new tests, athlete's beats test again, and soon. The drug testing official's then claim that based on their latest information, drug use is declining. This is comical, known all the data that indicates junior high school, high school, recreational, amateur and expert athletes are using steroids and other drugs.

Doping outcome could arise from supplement use in a number of ways:

•The supplement contains prohibited substances that are not declared as a stated ingredient.
•The supplement contains a banned substance within stated ingredients, but the athlete is unaware of the relationship between the products.
•The addition contains a banned substance as a stated ingredient, but the athlete is not conscious that the substance is banned or that it acts to cause a positive doping test.