Much current research is being done to validify Saint John's Wort's effectiveness as a mild tranquilliser for depression and insomnia. Also used as an anti-inflammatory, to treat lung diseases, urinary infections, reduce stress, and to promote healing of wounds and cuts. Extracts have been shown to inhibit the growth of mycobacterium tuberculosis (the most common cause of TB), also E. Coli, staphylococci, and also some strains of bacteria that are resisitant to antibiotics. Has shown anti-viral and anti-bacterial activity against herpes simplex, influenza and hepatitis B virus.