The 1st serum foundation by Yves Saint Laurent to be infused with the unique Glycanactif complex. This product is a combination of the technical expertise of the YSL SKINSCIENCE committee and the colour innovation of Yves Saint Laurent. It revives the skin's youthful brightness and enhances the complexion's natural colour tone. The skin looks smoother with a healty glow. Dull zones are neutralised creating a more uniform complexion.