Primarily designed for extreme endurance events lasting about six hours to many days. Perpetuem"s 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. Strawberry-Vanilla flavor. 260 calories per serving.