My favourite plant medicine! I've been making St. John's Wort/ St. Joan's Wort tincture & oil for 3 summers now and love using the oil for sore muscles & as a natural sunscreen and take the tincture as an anti-viral. When I read any studies on this plant, the side effects such as sun sensitivity are usually due to ingesting the dried form in tea or capsules so I just avoid taking it that way.