TEST HD is the first hardcore testosterone booster to include a clinical-strength dose of shilajit, a rare organo-mineral compound obtained from steep rocks of different formations found in the Himalayas and other high mountains. Shilajit in its natural state has no chemical definition. In order to yield a consistent and efficacious form of shilajit, the shilajit is obtained from carefully selected rocks and is put through a patented technology where it is purified and standardized. This form of shilajit is now assured of optimal levels of bioactive components such as fulvic acid and dibenzo-pyrones, and is known as the patented PrimaVie.* This powerful test-boosting compound is suggested in a human clinical study to help significantly increase total serum testosterone levels as documented after 90 days.