Methods: forty-nine adult rats were arranged in seven groups. No treatment control group, sham group was injected drug’s solvent, and treatment groups 1, 2, 3 were injected 5mg/kg/b.wt Cyclophosphamide daily. These groups were gavaged )0.5, 1, 2(mg/kg/b.wt Cinnamon extract daily. Group 4 was injected 5 mg/kg/b.wt Cyclophosphamide, and Group 5 was gavaged 2 mg/kg/b.wt Cinnamon extract. After 21 days, all rats were unconscious and blood was taken from their hearts. Immediately, the left ovary of them was removed and after fixation in 10% formalin solution and tissue processing, the sections with 5 micron thickness were prepared and studied. By centrifuging the blood, serum was isolated and the concentration of FSH and LH, estrogen and progesterone hormones was measured by ELISA method. The obtained data were analyzed with SPSS (18( and ANOVA, and they were compared with Duncan’s test.