Testosterone is critical for initiating male anabolic processes. The original TEST HD was 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 has been shown in published research to boost total serum testosterone levels in 90 days! TEST HD THERMO features a combination of powerful test-boosting ingredients, including this important clinical-strength dose of shilajit. The form of shilajit found in TEST HD Thermo contains optimal levels of bioactive components such as fulvic acid and dibenzo-pyrones, and is known as the patented PrimaVie.