Caffeine - Wikipedia, the free encyclopedia
Caffeine (/kæˈfiːn, ˈkæfiːn, ˈkæfiːɪn/) is a bitter, white crystalline purine, a methylxanthine alkaloid, and thus closely related chemically to the adenine and guanine contained in deoxyribonucleic acid (DNA). It is found in the seeds, nuts, or leaves of...
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