Smooth Care Smoothing Protecting Serum is ideal for use with straightening irons. It wraps a glossy protective film around the hair shaft to protect hair from dehydration. Smooth Care Smoothing Protecting Serum benefits: Linseed Oil is abundant in omega-3 fatty acids and promotes healthy hair growth. The skin revitalising and anti-inflammatory properties of Linseed Oil also assists with hair problems created by psoriasis and eczema. Keratin transforms frizzy, unruly hair into straight, shiny and healthy-looking hair.