Concentrated Serum. Yves Saint Laurent introduces a serum with double concentration* of its key ingredient ' Ganoderma Lucidum' an ingredient used in Chinese medicine. Wrinkles appear smoother & fine lines appear reduced after using Yves Saint Laurent Temps Majeur Serum. Nourished with moisture, skin appears more firm, nourished with moisture for a youthful looking radiance. Suitable for all skin types. * vs. original Temps Majeur serum. Directions for use: For best results use Yves Saint Laurent Temps Majeur Serum morning & evening on your face & neck before Temps Majeur Cream.