its a steroidal anti-aromatase (6-bromo) along with another AI. Similar to formestane, or ATD. Steroidal AI's are strong, 6-bromo had some evidence that it acted as a mild steroid/prohormone. Its also found in the product Jungle Warfare. You probably don't need something this strong, 6-bromo especially has been shown to cause some level of HPTA shutdown...