Anderson Silva  is often seen as a legend and one of the best fighters in UFC history. Unfortunately, his reputation was hurt after failing drug tests on two separate occasions.

The Prohibited List  Substances and Methods

Anabolic Androgenic Steroids (AAS) Anti-Aging and Hormone Replacement Therapies. Boldenone. DHEA. Pregnenolone. Testosterone. Stanozolol.
Other Anabolic Agents. Clenbuterol. Selective Androgen Receptor Modulators (SARMs) LGD-4033. Ostarine. Zeranol.