St John's wort extract is derived from the Hypericum perforatum plant, a yellow-flowering, rhizomatous, perennial herb indigenous to Europe, which has been naturalized in the Americas. St. John's Wort, also known as Tipton's weed, chase-devil or Klamath weed, it is commonly used in Eurasian and Native American traditional herbal medicine for centuries. PureBulk's St JohnÃ†s wort extract powder is standardized to contain at least 0.3% of the anthraquinone compound, hypericin.
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