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. Viviscal Professional Elixir promotes thicker-looking hair as part of the complete Viviscal Professional Thin to Thick hair care collection. Only Viviscal hair care contains Ana:Tel, a proprietary complex that includes clinically tested ingredients derived from natural sources, such as pea sprouts and grape seeds. Combined with Biotin, Collagen & Keratin, the Viviscal Professional Thin to Thick hair care collection promotes the appearance of healthy looking hair growth. For best results, use the Thin to Thick Elixir as part of the complete Viviscal Professional hair growth and hair care programs. Nourish hair growth from within with Viviscal Professional supplements, available exclusively from leading hair salons, spas and medical offices. Then, promote thick-looking gorgeous hair from the outside with Viviscal Professional Thin to Thick Shampoo, Conditioner and Elixir, and follow with the instant coverage of Viviscal Professional Volumizing Fibers. 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.