Willow Bark contains Salicin, an ingredient that is similar to aspirin which works to take away the pain. The thing that makes willow bark better than aspirin, however, is that it doesn’t have the same side-effects as aspirin and other painkillers, like damage to the liver or gastrointestinal problems. Many people find relief from migraines and headaches from consuming willow bark, and it also treats inflammation in the body. Recent studies have shown reduced pain in subjects with lower back pain. Willow bark is often used to naturally treat swelling and other pains from musculoskeletal disorders. Willow bark has also been used for those suffering from menstrual cramps because it regulates prostaglandins and reduces inflammation in the uterine lining.