Willow bark has been used for centuries around the world to soothe irritated skin because of its anti-inflammatory and antibacterial properties. The active ingredient used as medicine in the willow bark is salicin, which converts to salicylic acid by the human body, and has been used for pain relief as Nature’s natural “aspirin”.  The FDA has scientifically proven salicylic acid effectively breaks down dead skin cells and help treat conditions that affect the scalp, like seborrhea dermatitis and psoriasis.  FROM USA