Transform fine, flat strands into fabulously fuller hair with HASK's Biotin Boost Thickening Shampoo. This shampoo works on three levels to help deliver volume - featuring biotin to help hair look thicker, collagen to fortify locks, and coffee to help boost strands. Go big or go home! Free of sulfates, parabens, phthalates, gluten, drying alcohol and artificial colors.