FORMULA 18 Naked is a healthy approach to reparative hair care. Formulas are stripped of silicones, sulfates, parabens, gluten, soy, sulfur, and propylene glycol and are infused with the FORMULA 18 Plant Based Additive which will enhance the hairs' ability to maintain itself during chemical and heat services. FORMULA 18 Naked Smoothing Shampoo is a luxurious shampoo that helps smooth coarse, curly or frizzy hair. Great for giving a smooth, silky result.