In this study, we assessed in vitro minimum inhibitory concentration (MIC) values of some natural geranyloxycoumarins, geranyloxy-and isopentenyloxy acids against growth of Helicobacter pylori. Boropinic acid, active principle isolated from Boronia pinnata (Fam. Rutaceae), was seen to be the most effective compound with a MIC value of 1.62 μg/mL.