Viviscal Professional Thin to Thick Elixir is the ultimate lightweight, densifying leave-in hair care treatment that encourages thicker, fuller hair. This nourishing serum features Ana-Tel, a proprietary complex comprised of pea sprouts and grape seeds that helps to promote thicker hair. Biotin, collagen and keratin nourish and balance the scalp. The non-greasy, easy-to-apply treatment is suitable for all hair types and free of sulfates, parabens and artificial colors. Thicking Elixir is recommended for use alongside Thickening Shampoo, Thickening Conditioner, Volumizing Fibers and Viviscal Professional Supplements.