These shampoo bars are made with 100% pure tea tree oil. Tea tree shampoo is used to treat scalp conditions such as dandruff and to stimulate new hair growth by clearing out old dead skin cells from hair follicles. It has been said that due to the tingly feeling and fresh, minty smell, tea tree shampoo makes a person feel invigorated and energized. Our shampoo bars contain NO sulfates, parabens, SLS, waxes or silicones!