Aerobic endurance is the ability to sustain physical activity over extended periods of time. It plays a critical role in activities such as running, cycling, swimming, rowing, and many team sports. Improvements in endurance can help athletes train longer, perform better, and recover more effectively from demanding exercise. Researchers have studied numerous supplements for their effects on oxygen utilization, fatigue resistance, exercise capacity, and endurance performance. The supplements below are ranked according to the strength of the evidence and their expected real-world impact on aerobic endurance.