... world, ranging from parts of Europe, North America, and Asia. Used Part: extract from natural White Willow ... analgesic, Relieve acute and chronic pain, including headache, back and neck pain, muscle aches, and menstrual cramps. 3) Anti-rheumatism and function of constringency ... white willow bark have experienced reduced swelling and inflammation, and eventually increased mobility, in the back, knees, ...