... salicin, 25% salicin, 50% salicin HPLC Common names White Willow Bark Extract Specification 15% salicin, 25% salicin, 50% salicin HPLCCharacteristics ... ago, its active ingredient salicin was identified. White willow bark is a source of salicin and other salicylates compounds, ... Native Americans are thought to have used ground willow bark and bark steeped for tea as a medicinal remedy for everything ...