Biologique Recherche Serum VG Tensil is a toning and firming botanical face serum that helps tighten sagging skin tissues and revitalize the skin's surface. This firming serum is recommended for mature, thick, dull and devitalized skin types and uses Hazelnut Oligopeptides along with Rye and Manioc Extracts to increase skin-tightening proteins such as collagen.