Nature's Answer White Willow 1oz Alcohol Free Herbal Extract STRENGTH: Nature’s Answer White Willow Bark Extract Nature’s Answer Liquid Extracts are MUCH MORE CONCENTRATED than Liquid Tinctures. COMPARE: If you compare the milligrams you are getting per dose, you will notice that TWO DROPPERFULS (2 ml) are prepared from 2000 mg concentrated herbal extract! WHITE WILLOW BARK: Gluten Free,Vegan,Kosher, nonGMO HISTORY: Comfort Support* Helps Maintain Healthy Joints* HISTORY: During the time of Hippocrates(400 BC), people were advised to chew on strips of the willow tree bark, or make it into a strong tea. The bark contains many compounds , including salicin, which is a naturally occurring chemical constituent that was used to develop aspirin.