Redken's Extreme Length Conditioner with biotin strengthens damaged hair and helps hair to grow longer and stronger. Extreme Length Conditioner helps prevent breakage to promote your strongest, healthiest hair. When using Extreme Length's full sytem of shampoo, conditioner and sealer, you can help your hair to have up to a 81% decrease in breakage and up to 92% reduction of split ends visually. To use: After shampooing with Extreme Length Shampoo, apply and distribute through hair. Rinse. Follow with Extreme Length Leave-In Treatment with Biotin.