This study aims to determine the effects of wheat germ extract capsules on premenstural syndrome symptoms in women employed in hospitals affiliated to Hamedan University of Medical Sciences. Inclusion criteria: age should be between 20 and 45 years; BMI should be between 19/8 and 26; they should be non smokers. they should have 3 to 10 days bleeding in two months prior to study; Regular menstrual cycles should be 21-35 days; premenstural syndrome based on pre menstural syndrome provisional diagnosis questionnaire and daily form showing premenstural syndrome symptoms after 2 months should be proved; they should have no known mental illnesses; they should have no physical illnesses such as diabetes, seizure disorders, hypothyroidism and so on; There should be no death of close relatives, divorce or other adverse events in the last 3 months; Surgery should not be performed in the three months before entering study; Antidepressants, hormonal contraceptives, medroxy progesterone acetate, and vitamins should not be taken in the past three months; Exclusion criteria: pregnancy, incidents like the death of close relatives, divorce, and other adverse events; taking 3 capsules of wheat germ or less on two consecutive days, taking supplements, eating wheat germ. this study is done using triple blind, controlled clinical trial method on 84 women working in the morning shift at the hospital in Hamadan. participants complete daily symptom record form for two consecutive months and after definitive diagnosis of premenstural syndrome are randomly divided into two groups of 42 and for two consecutive months, they take 400 mg capsules of wheat germ extract 3 times daily from day 16 of menstrual cycle untill day 5 of menstrual cycle. Data are analyzed using SPSS-17 and descriptive statistics to assess the severity of premenstural syndrome.