Thalgo Source Marine Intensive Hydrating Serum quenches the skin's thirst and immediately increases its hydration. Seve Bleue des Océans seawater, rich in marine manganese, strengthens the skin barrier and limits water loss from the skin. At the same time, it restores water reserves and increases its exchange in the basal membrane. The filtrate of patented Micronized Seaweed supplies the skin with minerals and micronutrients that are necessary for its proper functioning. The skin is revitalized and strengthened. The serum also contains an extract of the Mediterranean brown algae Padina pevonica, which increases cell cohesion, limits the loss of water and minerals and supports their transfer between epidermal cells. The serum has a 2x higher concentration of active ingredients compared to creams. It has a light gel texture.