Cramp bark (Viburnum opulus)
Cramp bark (Viburnum opulus) is native to Europe, northern Africa, and northern Asia. It has been used throughout the world as an ornamental plant. The bark has traditionally been used for cramps, including menstrual cramps and cramping associated with arthritis. Interestingly, a laboratory study found that viopudial isolated from Viburnum opulus had antispasmodic effects on smooth muscle. However, there is currently insufficient available evidence in humans to support the use of cramp bark for any indication.
American guelder-rose, Caprifoliaceae (family), common guelder-rose, cranberry tree, European cranberry bush, guelder rose, pembina, proanthocyanidins, snowball tree, Viburnum opulus, Viburnum opulus L., Viburnum prunifolium L., viopudial.
These uses have been tested in humans or animals. Safety and effectiveness have not always been proven. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider.