Redken'S extreme length conditioner with biotin and castor oil strengthens and fortifies damaged hair and reduces breakage to promote the strongest, healthiest hair and help clients achieve their ultimate hair length goals. Knowing healthy hair can grow up to 3-6 inches in a year, extreme length: helps clients achieve their maximum hair length, up to 6 inches of growth in one year fortifies and strengthens hair for 81% less breakage - when use: as a shampoo and conditioner system. System vs. Non conditioning shampoo promotes healthy-Looking, strong hair from root to tip helps prevent split ends and reduce the look of split ends by 78% - when use: as a shampoo and conditioner system. System vs. Non conditioning shampoo