Hask Biotin Boost Conditioner has Tri-level Thickening Complex - Volumizing, Strengthening & Fortifying. Give fine, flat strands the boost they crave. This conditioner helps promote thicker-looking hair with biotin for volume, collagen for strength, and coffee to help boost strands. Gently detangles to leave hair feeling soft and manageable. Achieving thicker-looking hair just got a whole lot easier!