White Willow Bark Extract Details Product Name: White Willow Bark Extract Herb Source: Salix alba L. Part Used: Bark Active Ingredient: Salicin Appearance: Brown to White Powder Specification: 15%, 25%, 50%, 80%, 98% Test Method: HPLC CAS#: 138-52-3 Salicin Molecular Formula & Molecular Weight: C13H18O7; 286.28 Salicin Structural Formula: Pharmacology: Salicin is the active ingredient of White Willow Bark P.E.. It will be …