White Willow BarkWillow Bark (from the Salix tree family) is often called natures aspirin because it contains salicin, a compound that the body converts into salicylic acid, similar to aspirin. It has been used for thousands of years in traditional medicine, especially for pain and inflammation. Benefits of Willow Bark Natural Pain Reliever: Effective for headaches, back pain, and general body aches. Anti inflammatory: Helps reduce swelling, stiffness, and joint pain.