Support healthy function of the musculoskeletal system with Cramp Bark liquid extract from Herb Pharm. We prepare our Cramp Bark Extract from the bark of Viburnum opulus tree which is Sustainably Wildcrafted in its natural wild habitat. To assure optimal extraction of Cramp Bark's bioactive compounds, the bark is hand-harvested in the spring or fall, is carefully shade-dried, and is then thoroughly extracted.