Barberry is a traditional medicine of the American Indians. Research has shown that one of it's active ingredients, berberine, has anti-bacterial, immune-stimulating, and anti-spasmodic effects, justifying its positive effects in disorders of the liver and gallbladder. Barberry improves the flow of bile, relieves the pain, reduces the chances of gallstone formation and is helpful in dealing with jaundice and and hepatitis. Barberry bark has astringent qualities and this induces healing along the intestinal wall. Barberry has a highly beneficial effect on the functioning of the digestive system as a whole and is used in the traditional treatment of various digestive disorders. It's anti-bacterial properties are also employed in the traditional management of some skin disorders, including psoriasis.