Kérastase Elixir Ultime Oil Serum Before snapping one of her sultry selfies, Emily Ratajkowski likes to use Kérastase Elixir Ultime Oil Serum ($50) to add shine to dry ends. The lightweight blend of four oils also serves as a protective pre-blowout treatment that minimizes frizz and flyaways. Image Source: sephora.com Kérastase Elixir Ultime Oil Serum $50 from sephora.com Buy Now