HASK Biotin Boost Thickening Shampoo is a professional formula specially designed to volumize your hair, featuring Biotin, a natural plant extract. It strengthens hair follicles to reduce breakage and dryness, while also providing lasting manageability and natural shine. Free of sulfates, parabens and phthalates, this shampoo has been clinically tested to help reverse hair loss and promote healthy, thick hair growth.