Both American and Panax (Asian) ginseng roots are taken orally as adaptogens, aphrodisiacs, nourishing stimulants,[citation needed] and in the treatment of type II diabetes, as well as sexual dysfunction in men. The root is most often available in dried form, either whole or sliced. Ginseng leaf, although not as highly prized, is sometimes also used; as with the root it is most often available in dried form. A 2002 study by the Southern Illinois University School of Medicine (published in the annals of the New York Academy of Sciences) found that in laboratory animals, both Asian and American forms of ginseng enhance libido and copulatory performance. Korean Ginseng is also a traditional Chinese herb for vitality. It is used as an adaptogen, antioxidant, general tonic, immune regulator, immune regulator.