The most commonly used AAS in medicine are testosterone and its various esters (but most commonly testosterone undecanoate , testosterone enanthate , testosterone cypionate , and testosterone propionate ),  nandrolone esters (most commonly nandrolone decanoate and nandrolone phenylpropionate ), stanozolol , and metandienone (methandrostenolone).  Others also available and used commonly but to a lesser extent include methyltestosterone , oxandrolone , mesterolone , and oxymetholone , as well as drostanolone propionate , metenolone (methylandrostenolone), and fluoxymesterone .  Dihydrotestosterone (DHT; androstanolone, stanolone) and its esters are also notable, although they are not widely used in medicine.  Boldenone undecylenate and trenbolone acetate are used in veterinary medicine . 
[ Editor's Note: Chryste Gaines, MBA, Olympic gold and bronze medal sprinter and former teammate of Marion Jones in the 2000 Sydney Olympic Games, stated the following in a Dec. 22, 2008 email to in response to the IOC ruling:
"We are being unfairly punished. If the drug testing agencies cannot determine if an athlete is taking performance enhancing drugs how are the teammates supposed to know?... It negates all the family functions, church functions, and social events we missed in the name of winning an Olympic medal." ]
Due to a wide range of media coverage and large scale steroid scandals fans and experts have continued to bring the games integrity into question. Major League Baseball is a game of statistics. The entirety of a player's career is based upon the consistency and credibility of the numbers and accolades acquired during the period in which they played. "Their real impact has been at the margins: There are certainly some scrubs who wouldn't be in the majors without the juice, and we have ample evidence that at the other end of the scale, drugs can take Hall of Famers and all-time greats and help them perform at historically unprecedented levels" (La-Times). When it comes to this topic generally there are two trains of thought. Many do not see the harm with this type of substance use because it makes the game more exciting and allows athletes to reach untested potentials. On the other side of the argument many fans and experts believe the game has lost its purity because of this drug use. More recently an issue has arose with high-caliber players who have tested positive for performance-enhancing drugs are not being voted for on a hall of fame ballot. This fact has brought many to question the game's integrity. No matter the statistics and achievements produced by the certain player prior to drug use, a positive test for steroids has shown to discredit the athletes integrity and career entirely.