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Caffeine

Updated 3/9/2026
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Research Summary

Caffeine is a naturally occurring methylxanthine alkaloid and the most widely consumed psychoactive substance in the world. Primarily found in the seeds, leaves, and fruits of plants such as coffee (Coffea), tea (Camellia sinensis), and cacao (Theobroma cacao), it functions as a natural pesticide for plants while acting as a potent central nervous system stimulant in humans. In the context of nutrition and longevity, it is increasingly recognized for its role as a delivery vehicle for diverse phytochemicals and antioxidants that support cellular health.

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