Lemongrass, or Cymbopogon citratus, is a tall, aromatic perennial grass native to tropical Asia. The freshly cut and dried leaves of the plant have been used traditionally as a flavoring agent. The volatile oils of the plants contain a chemical called citral, which gives it medicinal value. Lemongrass supplements are available as capsules, powders, liquid extracts and oils. The individual recommended dose varies depending on your age and overall health. Talk to a doctor before using lemongrass extract for medicinal purposes.