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Heist Pre-workout contains 220 mg per serving
Caffeine is near the top of the list when it comes to the best performance boosters is sports science. It is shown to increase focus, endurance, and even aid in burning fat more efficiently. Many pre-workouts on the market have extremely high amounts of caffeine, between 300-500 mg, and rely upon the user feeling an instant jolt of energy. These high amounts can have unintended side effects and usually result in the user feeling "sick to their stomach" or "crash" after their workout. Heist provides a moderate amount of caffeine that still allows for other caffeine intake throughout the day if desired.
The FDA and Mayo Clinic state that healthy adults should consume no more than 400 mg per day. (5)
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