La Prairie White Caviar Essence Extraordinaire hydrates, brightens and tones with a lightweight essence texture that absorbs quickly into the skin. It prepares skin to better absorb the active ingredients from all other products in your face care ritual, while it conditions skin to increase firmness and elasticity over time. This pre-serum essence combines the hydrating and lifting effects of Swiss golden caviar water with La Prairie's breakthrough illuminating molecule Lumidose, the most potent inhibitor of tyrosinase, the enzyme responsible for the formation of hyperpigmentation — or age spots — in the skin.