St Johns wort for treating premenstrual syndrome?
A very recent study was published in the journal, CNS Drugs, which studied the effectiveness of Hypericum perforatum (St John's wort) in treating premenstrual syndrome (PMS).
The intervention group received Hypericum perforatum tablets 900 mg/day (standardized to 0.18% hypericin; 3.38% hyperforin) for two menstrual cycles.