alkaloid ksantynowy, inaczej teina, guaranina, naturalny składnik wielu roślin, między innymi w ziarnach kawy, kakao, orzeszkach kola, owocach guarany czy herbacie. Jest powszechnie wykorzystywana w produktach spożywczych, głównie napojach, a także w lekach. Ma działanie chroniące rośliny przed insektami. Kofeina poprawia koncentrację, zmniejsza odczucie zmęczenia, podnosi ciśnienie krwi.
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