Targets thinning ends: Specifically formulated to address split ends and areas of weakness in long hair. Thickens and strengthens: Patented Filler A-100 technology plumps the hair fiber, and amino acids strengthen it to help prevent future breakage. Reduces breakage and split ends: When used with the Pro Longer Shampoo, it helps reduce hair breakage by up to 95% and visibly reduces split ends by up to 17%. Adds shine: Leaves hair looking up to 5x shinier. Lightweight formula: Delivers noticeable results without making hair feel heavy. Suitable for color-treated hair: Safe for use on colored hair.