Sothys Hydroptimale Thi3 Hydrating Serum 50ml Intensive care to deeply treat hydration and reinforce the skin barrier. Formulated with similar active ingredients as the patented Sothys Hydroptimale THI 3 Institute Treatment, such as Optimizer SC and Plant Osmolytes, the Hydrating Serum is the foundation of the THI3 home care program. White Lupine Extract delivers proteins and lipids to the stratum corneum to improve and restore the barrier function. Cotton Seed Oil is a source of omega-3 and omega-6 essential fatty acids, responsible for restructuring the hydro-lipid film.