A-HD is a novel compound testosterone boosting agent testosterone is the primary male sex hormone and is highly anabolic. By promoting available free testosterone in the body, bodybuilders can utilize this hormone to support muscle growth, bone density, and strength. A-HD is a hormone support supplement that is designed to work by blocking/binding to the enzyme aromatase, helping reduce conversion to estrogen. Supporting healthy estrogen levels promotes a harder, leaner, dry looking physique. The ultimate result - no more retaining water, no more bloated looks - just rock-hard shredded muscle.