... 50%,70% ,80%,98% Test Method: HPLC White Willow Bark Extract/Salicin/Salix alba L White Willow Bark ExtractProduct Name : White ... LBotanical Source: White Willow BarkPart Used: BarkAppearance: Yellow or white Powder Active Ingredient: SalicinSpecification: Salicin 15%, 25%,50%,70% ,80%, ... Bark goes back as far as 500 BC when ancient Chinese healers began using it to control pain. Native Americans also ...