St. John's Wort: Basics
What is St. John's Wort?
St. John's Wort (Hypericum perforatum) is a plant with a wide variety of medicinal uses. Primarily, an extensive amount of clinical research shows that certain St. John's Wort extracts are effective in treating major depressive disorder.
In the United States, St. John's Wort products are available over-the-counter as dietary supplements, but these vary in effectiveness based on the amount of hyperforin that they contain.
Hypericum perforatum, also known as Klamath Weed or Tipton's Weed, is a perennial, yellow-flowering plant indigenous to Europe. It has been introduced to the Americas and grows wild in meadows in many temperate regions.