Product Description Redken’s Extreme Length Shampoo with biotin strengthens damaged hair and helps hair to grow longer and stronger. Extreme Length Shampoo helps prevent breakage to promote your strongest, healthiest hair. Fortifies and strengthens hair for 81% less breakage* 5x stronger hair Promotes healthy, stronger hair from root to tip * Extreme Length Shampoo + Conditioner + Leave-in Treatment versus non-conditioning shampoo