When active people are training with a goal in mind, pushing your body to its limit and the finish line takes endurance mentally and physically. Sport Endurance Liver Plus C Beef liver is traditionally valued as an energy-boosting food. NeoLife SPORT Endurance is a superior, concentrated source of natural “anti-fatigue” nutrients from pure liver and enhanced by the antioxidant properties of vitamin C.* NeoLife SPORT Endurance is derived from 100% pure Grass-fed South American beef liver. Beef liver is a densely nutritious food rich in high quality protein, B-complex vitamins, particularly B12, plus iron and an array of trace minerals. Because of the synergistic ratios in which these nutrients naturally occur, liver is an excellent energy food.