Standardized to .3% hypericin synergistically supported by the whole herb. Our Hypericum extract is synergistically blended with premium quality, whole St. John s Wort herb in the perfect balance to ensure consistent hypericin content in each capsule. St. John s Wort, or Hypericum perforatum , is a perennial plant which grows on sunlit hillsides and forest edges. Its attractive yellow flowers release a blood-red juice when crushed. They bloom from June until August and are considered to be most potent during the flowering season, particularly on St. John s Day . This may account for its traditional historical uses.