Toppik Hair Building Shampoo can be used alone or in combination with Toppik Keratin Hair Conditioner. Toppik Hair Building Shampoo works to thicken your hair with a unique complex of Keratin proteins. Toppik Shampoo will dilate every hair shaft to allow maximum penetration of this concentrated protein formula. You will instantly see a dramatic thickening of your hair's diameter. Use every day for continued thickening and protein enhancement. Adds serious thickness to thin hair.