Some studies have shown that ephedrine and caffeine are effective in increasing performance by delaying time to exhaustion and decreasing an athlete's perception of fatigue.

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Several studies have found that ephedrine and caffeine can enhance performance by increasing alertness, delaying fatigue, and improving oxygen utilization in the muscles. However, their use has also been associated with various side effects and health risks, and they are banned or restricted by many sports organizations.

Some Studies Have Shown That Ephedrine and Caffeine Are Effective