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Workout Energy and Performance Comparison Pre-Workout Supplements and Training Intensity Pre-workout supplements are commonly used before intense gym sessions because stimulant ingredients such as caffeine may temporarily support: Mental alertness Workout motivation Focus during training Perceived energy levels Power output during resistance exercise This is one reason many gym-goers use pre-workouts before: Heavy resistance training High-volume gym sessions Explosive workouts Intense training days Because of their stimulant content, some individuals experience a noticeable increase in workout intensity shortly after use

The largest of these (still fairly small, n=159) was a randomized and controlled clinical trial published in the New England Journal of Medicine , and found that a dose of 100 mcg twice per day improved quality of life, reduced eye involvement, and slowed disease progression among participants with mild Graves' orbitopathy (compared to pentoxifylline or placebo)

In reality, their mechanisms are different

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This in turn helps support memory health, focus and alertness, improved sleep and muscle contractions