Product Description Primarily designed for extreme endurance events lasting about six hours to many days. Perpetuems unique formula containing complex carbohydrates, soy protein, healthy fats, and key auxiliary nutrients such as sodium phosphate is unsurpassed for maintaining optimal athletic performance for as long as you want. Perpetuem provides consistent, reliable energy, maximizes stored fat utilization, and buffers lactic acid to prevent muscle fatigue. Orange-Vanilla flavor. 260 calories per serving.