Gain extra body and oomph with HASK Biotin Boost Thickening Shampoo - formulated with biotin, collagen and coffee to provide nourishment to your tresses and help create a look of fullness and strength. Leave behind sulfates, parabens, phthalates, gluten, drying alcohol, and fake colors in favor of lush, voluminous hair that looks like you spent a fortune at the salon. All that's left to say is: go big or go home!