White Willow Bark Extract: Appearance:Light brown fine powder Specification:Salicin(15%, 25%,50%) Test Method:HPLC White Willow Bark ExtractIndications and UsageWhite Willow Bark contains salicin, which the body converts to salicylic acid and has the same effect on the body as aspirin without any of the side effects. In fact, White Willow Bark was the basis for the synthesis of aspirin. History ...