On commercial websites, up to 32 different forms of anabolic steroids are listed. Some, like Nebido, have purely medical use. Anadrol is an example of a steroid that may be used for both medical and performance purposes. Other compounds, such as Dihydrotestosterone (DHT), which plays a role in male pattern hair loss, can only be obtained through prescription from your doctor. Types of steroids include: Anabolic-androgenic steroids (AAS) are chemical analogs of testosterone. They enhance the effects of testosterone by binding to receptor sites on muscle cell membranes. AAS were originally developed as medicines to treat conditions caused by low testosterone levels in men. However, some athletes have abused anabolic steroids by taking large amounts for non-medical reasons - usually in an effort to gain greater strength or size. Abusers often report that the drugs make them feel more masculine and able to cope with the stress of training hard. AAS come in two main forms: injectable and oral. Both types enter the body through the stomach lining and are absorbed directly into blood vessels. Injectable steroids are given as shots under the skin, while others are taken by mouth. All AAS bind to hormone receptors inside cells, but not all cells react the same way to each drug.