Hypericum perforatum is an old, aromatic herb classified in the family Hypericaceae. Other names for it include St John's wort, Tipton's weed, rosin rose, goatweed, chase-devil, or Klamath weed. The herb originates from Europe. Nowadays hypericum perforatum exists all over the world (mainly in the Unated States). It can be found in such places as river banks, meadows, road sides.