Caffeine is a natural stimulant found in coffee, soda, tea, and other sources. It takes effect on the central nervous system, boosting energy wakefulness, improving sustained attention, alertness, memory, endurance, and cognition. Caffeine is the most widely used and scientifically supported psychoactive substance in the world. Even more importantly, studies show that L-Theanine works better with Caffeine at a 2:1 ratio to enhance cognitive benefit. In fact, Caffeine + L-Theanine together produce cognitive benefits not seen when either is used alone. This includes mitigating cerebral blood pressure caused by caffeine alone, and improvement in word recognition, information processing, attention and mood.
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