Quintessential serums are the purest formulas of all in the Biologique Recherche range. They contain nothing but active ingredients, in the form of amino acids or short peptides. They are designed to target specific imbalances like dehydration, lack of vitality, fine lines, seborrheic skin and other issues. They’re able to penetrate the epidermis rapidly and efficiently, creating outstanding and powerful results. Discover our range and cocktail up to four different serums together.