Dong Quai, or Anjelica, is an aromatic herb that grows in China, Korea, and Japan. It is used as a supplement because of it's prized levels of Lingustilides. Just Vitamins' Dong Quai is available in a vegetarian capsule, and is standardised to provide the equivalent of 500mg of Dong Quai (from 83.3mg of 6:1 Standardised Extract), along with a high level of Lingustilides.