Redken Extreme Length Conditioner with Biotin and Castor Oil and Redken's Length Care Complex is for strengthening damaged hair to grow longer and stronger. This hair conditioner helps hair growth by preventing breakage so your hair can keep growing longer. 81% less breakage when using the full Extreme Length system (shampoo, conditioner & treatment) -Formulated with biotin and castor oil -Provides lightweight nourishment -Strengthens fragile strands and ends for longer hair -Conditions and adds shine. Brand Story Redken is the #1 professional brand in North America. Powered by science, prescribed by professionals, Redken creates products with the highest quality ingredients, delivering powerful hair transformations for all hair types.