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Caffeine holds the distinction of being the most commonly consumed psychoactive substance worldwide, with approximately 80% of the global population incorporating it in various forms. Extensive research has shed light on its effectiveness and its interaction with the human body. However, it's important to note that alongside the wealth of accurate information, there exists a significant volume of misinformation on this topic.
When consuming caffeine, one can typically anticipate experiencing its effects within a span of 10 to 15 minutes, with these effects persisting for approximately 3 to 4 hours. For improved concentration, a commonly recommended dosage of caffeine is around 200mg (Source).