Biologique Recherche Sérum TEWL (Trans Epidermal Water Loss) is a super-rich serum that locks in moisture and is highly recommended for lipid-deficient skin types. Serum TEWL combines mink fat to re-lipidate, barbary fig extract, jojoba and sesame oil to protect, and raspberry seed and cranberry seed oil to revitalize and replenish the skin’s surface will give skin immediate comfort and protection. Serum TEWL is a great nurturing serum for colder climates and for use on skiing holidays to eliminate sensations of tightness. Recommended for dry and dehydrated skin conditions. Available in 8 mL / 0.3 oz. and 30 mL / 1 oz.