PGAnabolics Steroids androgenic, or AAS, are used to build muscle mass in athletes. These drugs are banned by most professional sports organizations for the reasons that they can cause severe side effects and lead to long-term health problems. In addition, it is illegal for a person without a prescription to buy anabolic steroids. Anabolic androgenic steroids, or AAS, are synthetic hormones or steroidal compounds that are used to build muscle mass. They are mostly taken orally, injected, or rubbed into the skin. It is important to note that AAS are not approved by the FDA in the United States and their use has serious side effects on health such as blood clots and kidney damage.