Flat hair can be caused by several factors, such as an oily scalp, product buildup, and unsuitable hair care products. Wash your hair twice with shampoo, and use Volume Infusion in your shampoo (during the second wash) and conditioner. Apply conditioner and hair mask only to the lengths of your hair. Our products contain gentle ingredients with nutrients that nourish your hair and scalp; they are free from sulfates, parabens, benzene, and cyclic silicones, and are 100% vegan.