Herb Pharm Cramp Bark Liquid Herbal Extract Description: Liquid Herbal Extract Viburnum Opulus Spring-Harvested Bark Description: : We prepare our Cramp Bark extract from the bark of Viburnum opulus tree which is Custom Wildcrafted in its natural wild habitat. To assure optimal extraction of Cramp Bark's bioactive compounds, the bark is hand-harvested only in the early spring, is carefully shade-dried, and is then thoroughly extracted. Our Cramp Bark is never fumigated or irradiated. Disclaimer These statements have not been evaluated by the FDA. These products are not intended to diagnose, treat, cure, or prevent any disease. Weight (lbs): 0.17