Although St. John’s Wort has a variety of traditional uses, extracts of this flowering perennial are best known for their mood balancing properties. St. John’s Wort extract is widely recognized for its positive, supportive effects on mental and emotional function. Like many botanicals, St. John’s Wort has been used for thousands of years, but is now gaining immense popularity both in the United States and abroad. High tolerability, minimal side effects, and of course its efficacy are credited for the growing popularity of St. John’s Wort.