I-caffeine ingafaka imiphumela yotshwala, ikwenze uzizwe uqaphile. Lokhu kungaholela engcupheni yokuphuza utshwala obuningi kunokujwayelekile noma ukuzibandakanya ekuziphatheni okuyingozi. Kungcono ukugwema ukuxuba utshwala ne-caffeine.

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