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Joint and Muscle Health400 mg Per CapsuleHerbal SupplementNatural Source of SalicinFull Spectrum® Whole Bark FormulaScience-Backed Quality Since 1969Complementary ingredient used for joint and muscle comfort.White Willow Bark has also been used throughout Europe as a traditional herb to comfort joints and muscles. Swanson White Willow bark features a glycoside compound known as salicin.