At Viviscal Professional, we understand the science of hair growth* from the inside and outside. Viviscal Professional Thin to Thick Elixir is the ultimate, lightweight, densifying leave-in treatment for thicker, fuller, gorgeous looking hair. Why Viviscal Professional Thin to Thick Elixir? Promotes thicker looking hair with Ana:Tel, a proprietary complex containing clinically tested ingredients derived from natural sources, such as pea sprouts and grape seeds Nourishes with Biotin, Collagen Keratin Non-greasy formula that is easy to apply Suitable for all hair types Botanical fragrance leaves hair infused with a refreshing scent that lasts Free from Sulfates, Parabens Artificial Colors