Natural training supplement. Raises lactate threshold/ builds endurance, speeds workout recovery, increases cardiac efficiency. All natural maximum strength Endurox plus vitamin E exceed your personal best guaranteed. Endurox Excel dietary supplement, taken as part of your training regimen, is guaranteed to help you exceed your personal best. Endurox Excel contains maximum strength Endurox, the standardized extract of the herb ciwujia, plus the antioxidant vitamin E. This unique combination builds endurance, raises the lactate threshold, speeds workout recovery and increases cardiac efficiency by lowering heart rate while maintaining the same level of workout intensity. During exercise, Endurox Excel shifts the energy source from carbohydrate to fat. This carbohydrate shift slows the buildup of lactic acid reducing muscle fatigue, and also increases fat metabolism up to 43%. Vitamin E has been shown to improve recovery by preventing the buildup of free radicals associated with muscle damage and soreness. Endurox Excel is not a stimulant and has been used extensively without reported side effects.