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 . 
As you become more experienced in the implementation and maintenance of steroids cycles, you may find that you’re ready to try your hand at the best steroids stacks. These are multiple products used in conjunction with each other for both expedited and enhanced results. Stacking is only for seasoned bodybuilders who have a clear understanding of how these products affect their bodies. Even the very best steroid stack can have a host of adverse effects if you aren’t ready for the stress that this system causes. Thus, it’s generally best to run several bulking and cutting cycles using standalone products before attempting to implement the best steroid stacks.
The prevalence of performance-enhancing drugs in sports has increased in the 43 years since Mirkin, a physician and sports medicine expert, handed out his survey. The desire to win is, naturally, ever present while, at the same time, new research and technologies have expanded the number of options for cheating your way onto the podium. For example, today's performance-enhancing drugs come in many forms other than a pill ("the cream and the clear," a testosterone-based ointment described by accused athletes in court testimony, comes to mind), but the results they produce are still highly sought after. Professional cycling has been repeatedly rocked by revelations and allegations of drug use. Every two years as the Olympic Games begin, we hear about athletes using or at least being tested for performance-enhancing drugs. Major League Baseball is still trying to repair its image from the steroid era. And the list goes on.