Le Grand Sérum is a sublimating elixir, a genuine concentrate of beauty whose action grows more intense with each consecutive application. It is recommended for all Skin Instants. With its exceptional results, it leaves the skin plumped up, toned up and luminous. Apply a few drops of Le Grand Sérum to clean skin all over the face, neck and décolleté with light upward strokes. Use mornings and/or evenings. This product is intended as a final touch of your Biologique Recherche skin care program.