Pre-Workout Supplements If you require an extra boost in energy and focus prior to the workout, pre-workout supplements can help. These supplements are designed to improve performance sports nutrition products, boost alertness, and prevent fatigue. The most common ingredients are caffeine, beta-alanine, as well as nitric oxide boosters. Supplements for pre-workout will provide you with the edge you require to perform well during intense training sessions and help you reach the potential of your body.