White Willow Bark Extract, CAS# 138-52-3, is a mixture of natural ingredients isolated from White Willow Bark, available as Light Yellow Fine Powder. White Willow Bark Extract is widely used as nutritional supplement. It is widely accepted as safe additive in many countries. Foodchem International Corporation has been supplying quality White Willow Bark Extract to customers all over the world for over 10 years.