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Caffeine is an alkaloid that is extracted from coffee beans. It's known as one of the most consumed stimulants worldwide, although caffeine is has many other properties that not everybody knows like an increase in anaerobic and aerobic performance, and in catecholamines, which enhances the use of fat as an energy source. It also has been observed that testosterone levels can be increased by 12%, which makes it a basic supplement for any athlete.

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