Product Name: White Willow Bark P.E., White Willow Bark Extract Powder Active Ingredient: Salicin Synonyms: Salicoside, Salicyl ... inflammatory. Researchers believe that the chemical salicin, found in willow bark, is responsible for these effects. However, studies ... have identified several other components of willow bark which have antioxidant, fever-reducing, antiseptic, and ...