The key ingredients in Test HD have been shown to significantly increase testosterone levels. TEST HD® requires no cycling on and off, and is formulated with scientifically researched ingredients such as shilajit and boron. TEST HD also contains other well-known ingredients, including stinging nettle root, tribulus and velvet bean. MuscleTech Test Hd Dietary Supplement is a dual-action muscle building and thermogenic formula, designed to increase testosterone production to support anabolic activity while simultaneously delivering a key ingredient that boosts thermogenesis. In men, testosterone is a critical component of muscle, strength, and vitality. It delivers a powerful dose of caffeine which is designed to enhance energy, for better athletic performance during your toughest workout sessions