Product Description This is the New/Improved Tribex. Tribex's active ingredients are: Tribulus Terrestris, a very unusual, very powerful herb that has been shown in numerous studies to elevate testosterone levels. Most researchers and scientists believe it works by positively affecting levels of luteinizing hormone, which in turn positively affects levels of testosterone. Many companies market and sell various tribulus formations, but very few harvest the right parts of the plant at the right time of the year (certain parts of the plants, at certain times of the year, contain higher levels of saponins, the active ingredient). Avena Sativa, a plant that has chemical properties that increase the levels of free testosterone in the body. These components synergistically elevate testosterone levels higher than any other legal supplement on the market, and as high as certain illegal drugs. It's truly a steroid alternative.