Effectiveness of St. John's Wort

In a larger case study was done at Duke University Medical Center in 2002 saying that St. John's Wort is not effective.
The 340 patients, unaware of which treatment they were receiving, were given a dosage three times a day for eight weeks.
The patients were assessed weekly or biweekly and those that responded, at least partially, during the first eight weeks were entered into an 18-week continuation phase.After eight weeks, improvement was cited in 32 percent of patients treated with a placebo, versus 24 percent of those taking St. John's Wort, according to the study. But the study was only done with people with severe depression. Other sturies have been done to proving that the alternative drug works with people who have mild depression