What it is: A lash-conditioning undercoat that enhances the benefits of other Clinique mascaras, moisturizes, and helps to condition dry lashes. Ingredient Callouts: Free of sulfates SLS and SLES, parabens, phthalates, and mineral oil. This product is also vegan and gluten-free. What Else You Need to Know: Lash Building Primer is ophthalmologist-tested. Please note: Lash Building Primer is not recommended for use with Lash Power Mascara, High Impact Curling Mascara, or Bottom Lash Mascara (each sold separately).