... the tree thrives near streams or rivers. White willow grows in diverse regions of the world, ranging from ... America, and Asia. Used Part: extract from natural White Willow BarkActive Ingredient: Salicin(Salicoside)CAS No.: 138-52-3Specification ... , Control arthritis discomforts. Some arthritis sufferers taking white willow bark have experienced reduced swelling and inflammation, and eventually ...