Redken Extreme Length Shampoo with Biotin is for strengthening damaged hair to grow longer and stronger. Extreme Length Shampoo helps prevent breakage so your hair can keep growing longer. Design house: REDKEN. Series: Extreme Length Shampoo. Gender: Unisex. Category: Hair Care. SubType: Shampoos & Conditioners. Beauty group: Hair. Size: 33.8 oz. Barcode: 884486456199. REDKEN Extreme Length Shampoo 33.8 oz Hair Care 884486456199. This item is only valid for shipment in the Contiguous United States.