Swanson Full Spectrum White Willow Bark - White Willow Bark White willow bark has been used throughout Europe as a traditional herb for joint and muscle relief. It contains a glycoside compound known as salicin, which is rapidly metabolized to salicylic acid with anti-inflammatory and analgesic actions. It is used for the treatment of pain, such as back pain, pain from rheumatic diseases, headache, toothache, aches and cramps. In America, it is used by herbalists as a mild analgesic and anti-inflammatory. For joint and muscle relief Natural source of salicin Whole bark composition (Full Spectrum®) Dosage: Take 1 capsule 3 times daily with water and food.