Nars Skin Treatments Essential Vitamin Serum This essential vitamin serum from nars is a fast-acting, lightweight serum that helps revitalise dull skin and promote visibly smoother skin for a more luminous appearance. Chestnut Rose Fruit and vitamins A, C and E improve clarity and provide antioxidant protection for a visibly firmer, smoother and more youthful-looking appearance. Benefits: Helps protect against free radical damage, Improves skin’s clarity.