Cramp Bark comes from Viburnum Opulus, a deciduous shrub in the Adoxaceae family. The berries from Viburnum Opulus can be made into jam, but the bark is favored in traditional European herbalism for its strong potential to product wellness supporting properties. Cramp Bark is also reffered to as "Guelder Rose," and can be decocted, infused, or tinctured.