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| Hypericum perforatum, known as perforate St John's wort is a flowering plant in the family Hypericaceae. Although used in traditional medicine with possible, high-quality clinical evidence for its effectiveness remains absent |
| Common St John's wort has long been used in herbalism and folk medicine. |
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| It was thought to have medical properties in classical antiquity and was a standard component of theriacs, from the Mithridate of Aulus Cornelius Celsus' De Medicina to the Venice treacle of d'Amsterdammer Apotheek in 1686. Folk usages included oily extract ("St John's oil") and Hypericum |
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Hypericum perforatum is a common species and is grown commercially for use in herbalism and traditional medicine. The red, oily extract of H. perforatum has been used in the treatment of wounds for millennia, including by the Knights Hospitaller, the Order of St John Wort after battles in the Crusades, which is most likely where the name came from. |
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