St. John’s wort may reduce the effectiveness of your estrogen, which may result in symptoms of menopause.Click to see full answer. Just so, does St John’s Wort increase testosterone?St. John’s Wort Does Not Mitigate Antiandrogenic Effects of OCs. She reported that testosterone levels decreased, while a marker of androgen metabolism increased, in 15 healthy women treated with St. John’s wort and Loestrin 1/20 (norethindrone/estradiol) during a 4-month study.Similarly, what are the side effects of St John’s wort? Other side effects of St. John’s wort are usually minor and uncommon. They may include upset stomach, dry mouth, headache, fatigue, dizziness, confusion, sexual dysfunction, or sensitivity to sunlight. Accordingly, can St John’s wort affect your menstrual cycle? John’s Wort. St. John’s wort (Hypericum perforatum) is taken for depression, anxiety, obsessive-compulsive disorder, attention deficit hyperactivity disorder, and other mood disorders. Irregular menstrual bleeding and breakthrough bleeding have been reported in women who were taking St.Why does St John’s wort interfere with everything?St. John’s wort increases a brain chemical called serotonin. Some medications for depression also increase the brain chemical serotonin. John’s wort along with these medications for depression might increase serotonin too much and cause serious side effects including heart problems, shivering, and anxiety.