The synthetic produced Aspirin, which thinens blood and kills pain, has almost totally replaced the use of the White Willow tree. From the bark of White Willow stems Salicylic acid, the phyto-therapeutic equivalent of the synthetic Acetylsalicylic acid (ASA).
Salicylic acid is anti-inflammatory, helps to reduce fever and to manage pain. The small but very important difference between the natural and synthetic form is: Our body converts slowly the Salicin present in White Willow bark into Salicylic acid. It takes longer to work, but has not the dreaded side-effects associated with ASA like internal bleeding and stomach problems.