Seven Rehab Shampoo is the perfect shampoo to rehabilitate dull dry limp hair back to health. Infused with vitamin B7 which is called Biotin. As we all know, Biotin is one of the super vitamins for hair health. It binds to the hair to strengthen and minimize split ends and breakage. Biotin also nourishes the hair follicles improving the strength, elasticity and durability of the hair shaft.