Drugs definitely enhance performance, but they also might have some severe side-effects on the human body. Keeping this in mind, this performance enhancing drugs are not legal. Yet, many fighters indulge in such activities to increase their performance in the ring. They are so eager to perform that they don't even think about the risks involved.
PED's (Performance enhancing drugs) enhance the performance of a fighter in various aspects like punch strength, reflexes or stamina. MMA often conducts drug tests to make sure that there are no cheats in the game.
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Vitor became famous overnight as he became the youngest UFC champion of the world. But, after a drug test in 2006, he was accused of taking PED's to enhance his performance. He was punished with a nine-month suspension along with a 10,000 dollar fine. Yet again he was caught in 2014.
Ironically, Marquardt liked to call himself "The Great". He was accused of taking high levels of steroids in a drug test in 2005. He was slammed with a 5-month suspension. In 2011, he was caught red-handed yet again.
Nick Diaz was very unlucky when it comes to bans. He was caught with very high level of marijuana and was put on immediate suspension for 5 years and was slammed with 150,000 dollars fine. He was unlucky as the fighters who took the PED's; even they were not slammed with such punishments.
The kickboxer from Thailand was pretty famous before he was caught with high levels of Boldenone, a drug which increases the performance to a very high extent. The man came in clean after many years but was not able to connect with his fans at that time.
Cung Lee was caught with high levels of growth hormones in his body. This was not very serious as fighters often take these hormones to be able to compete with the other fighters. To your surprise, Leo Messi also took these hormones.
Stephan took steroids twice in his career. He was caught the first time, and was not taken action upon but he did not learn his lesson and repeated the same mistake again in his career. He tried to blame it on his trainer but did not succeed.
The only woman in the list, Cyborg used performance enhancing drugs to improve her performance in the ring. This worked for several days until she got busted and was slammed with a year ban and 2500 dollars fine.
Thiago faked a drug test and gave an animal's urine sample instead of his. He admitted to this and was punished with 33,500 dollars of fine and 12 months ban. He was declared guilty the moment he admitted his mistake.