, Free Shipping with orders of $75 or more. Get in touch with us and we'll talk... Cramp bark is popular as a female regulator, as it helps combat problems related to the menstrual cycle. Cramp Bark has a long history as a natural muscle relaxant. Historically the eclectic physicians recommended it to support the body's adaptation associated with menstruation. Cramp bark is considered a uterine decongestant. It is also known to treat conditions related to neurological disorders, like, hysteria, convulsions, lock jaw, and nervous debility. Overview - In North America you will find this 8 to 12 foot deciduous shrub in much of woodlands of the eastern United States.Viburnum is known as Kalyna in the Ukraine and is very much a part of their folk tradition pictured in embroidery work, mentioned in folk songs, and in Slavic mythology.