Doo Gro Leave-In Growth Treatment Conditioner promotes strong, healthy, growing hair, strengthens and rebuilds, stops hair breakage. Extra light formula. Growth Treatment Conditioner is a non-greasy, non-oily formula repairs damaged hair and mends split ends. It also adds luster, conditions, softens and add beautiful shine to hair. Treatment Conditioner is extra light and safe to use on all types of hair including colour treated, bleached and relaxed.