Thank you for your interest in LVHS Cyclesmart (formerly ESTROsmart Plus). This product contains ingredients selected to help stabilize menstrual cycle irregularities and for antioxidant benefit to support liver detoxification specific to balancing estrogen and progesterone levels. Diarrhea is not a know side effect and would be unique to the individual based on factors such as dose, diet (fibre high/low) as well as liver and colon health. You may wish to reduce your dose and observe how your body responds. However, if at any time you feel your symptoms worsen or you feel concerned about using the product you are advised to discontinue use. Please do review caution labels carefully and consider consulting a health care professional regarding your best personal care.