Cramp Bark is a natural remedy that is derived from the bark of Viburnum opulus. It has been used for its medicinal properties for centuries, particularly for the relief of menstrual cramps and other types of spasms. Some synonyms for Cramp Bark include Guelder-rose, European Cranberry, Snowball Tree, and Water Elder. This herb is also known as the Cranberry Tree, due to the resemblance of its fruit to the cranberry. Cramp Bark is available in various forms such as tinctures, capsules, teas, and dried herb for use in homemade remedies. Whatever the name, Cramp Bark continues to be a popular remedy that offers relief from painful spasms and cramps.