An extraordinary occurence case of dengue in Indonesia make the value of guava increase. guava juice, specially which is rose colored, anticipated can improve the trombosite. In the reality, its not the guava fruit juice that improving trombosite rate , but its leaf extract. Guava leaf extract can pursue the growth of virus of dengue. In fact, its also can improve the amount of trombosite till 100.000 mm2, without a side effects! Result of examination, the amount of trombosite make-up estimated can reach during 8-48 hour or 2 day after guava leaf extract consumed.