Willow bark is derived from the bark of the willow tree, which belongs to the Salix genus. This natural substance has been used for centuries in traditional medicine due to its potent anti-inflammatory and analgesic properties. The primary active ingredient in willow bark is salicin, which is chemically similar to aspirin. When consumed, salicin is metabolized into salicylic acid in the body, providing relief from pain and inflammation. Willow bark is commonly used to alleviate headaches, lower back pain, osteoarthritis, and other conditions associated with inflammation. It is available in various forms, including teas, capsules, and extracts. However, it should be used with caution as it can cause side effects similar to those of aspirin, such as stomach irritation and allergic reactions. It is also not recommended for individuals who are allergic to aspirin or who have certain medical conditions.