Natural Instincts is the only hair color clinically proven healthier. Its system is formulated with aloe, vitamins and no ammonia. So you get all the gorgeous, without all the guilt. . Non permanent, ammonia-free formula works in just 10 minutes. Lasts through 28 shampoos. Gently blends away gray. Includes Natural Instincts week 2 color refresher, a conditioning creme formula that deposits color pigments 15 days after coloring. Includes Color Treat Conditioner for radiant and healthy-looking color. Leaves no visible root line.