St. John's Wort

St. John's Wort (Hypericum perforatum) is a perennial plant that produces numerous small yellow flowers. It is a common plant in many parts of the world including Canada.

Modem scientific research has shown that extracts of St. John's Wort (usually made from the flowering tops) have a wide range of effects that include antidepressant, antiviral and antibiotic as well as increasing the healing rate of burns and wounds. Historically, St. John's Wort has been used as a nerve tonic. Modern research has shown that extracts of St. John's Wort inhibit the actions of an enzyme (Monoamine Oxidase) in the brain. This results in an increase in the level of activity of the neurotransmitter serotonin. Increased serotonin activity levels results in an antidepressant effect in depressed individuals.

Clinical studies in Germany have demonstrated that extracts of St. John's Wort produces significant improvements in symptoms of anxiety, apathy, depression, insomnia and feelings of worthlessness.

St. John's Wort is very safe when taken long term at the recommended doses. However, individuals who take large excessive doses have developed some photosensitivity. Therefore it is recommended that fair skin individuals avoid excessive exposure to the sun. When using St. John's Wort individuals should avoid consuming beer, wine, cheese as these foods act as antidotes to the effects of St. John's Wort.