Sixteen healthy women who had taken a low dose oral contraceptive (OC) with 20 mcg ethinylestradiol + 0.15 mg desogesterol for at least 3 months participated in this study. A 50% ethanol extract of St. John’s wort 250 mg twice daily standardized to 0.2% hypericin (1 mg/day) and < 0.2%(< 1mg/day) hyperforin was initiated day […]