Kérastase Elixir Ultime Oil Serum Kérastase Elixir Ultime Oil Serum ($24-$50) protects my hair from the breakage that happens when it dries out in humid air. This product instantly makes my hair super-shiny after styling (with maize and procaxi oils inside), but I also like to use it as pre-shampoo to help remove impurities and buildup before cleansing. Image Source: sephora.com Kérastase Elixir Ultime Oil Serum $24 from sephora.com Buy Now