Best Pre-Workout for Athletes & Gym-Goers: We went the extra mile to create a science-backed, pre workout powder that helps improve body composition and athletic performance without the side effects of harsh stimulants and banned ingredients. Nitrosurge contains clean, effective, and pure ingredients that athletes and gym-goers can count on, including L Citrulline, Betaine Anhydrous, Beta Alanine, Caffeine, L Theanine, and more.