This herb is used as a treatment for depression and other mental illnesses.
It is dangerous to take St. John's Wort alongside any medically prescribed anti-depressants, as it can cancel out the effects of either medicine, making the taking of them pointless. This is extremely risky depending on the diagnosis. It can also cause photosensitivity.
St. John's Wort can be taken in tablet/capsule form, or as a tea.
St. John's Wort tablets, taken once a day. (Source Unknown. Product of Kira)