Introduction: High Body mass index, is a common problem in the people , especially women , that can cause a variety of diseases . Increased BMI as a health problem and epidemic in the world and is growing .

  Methods: this was a clinical trial study that has been done on 150 women in khomain. They were divided into two groups of 75 members. in the first group vitex agnus castus and the second group capsules of Evening primrose oil was given for 3 months. before the study and during the 3 months later BMI were assessed by questionnaire .

  Results: mean age of two groups were 27.9 and 28.8, that there was no statistically significant difference. Mean of BMI in first group was 22.94 ±1.621 and in second group was 22.81 ±1.241 . after 3 months there was no statistically significant difference between two groups. ( Paired t test , with p= 0.644 for vitex agnus castus group and p=0.085 for Evening primrose oil.

  Conclusion: Although the Vitex Agnus Castus and Evening Primrose oil have compounds With hormonal or metabolic changes in the body can lead to weight loss and obesity. However, this effect was not observed in this study and the use of Evening primrose oil for this purpose is not recommended due to its high price