This is a highly concentrated serum with 3% hyaluronic acid that provides intense and long-lasting hydration and replenishes moisture levels in the skin while soothing, protecting and strengthening the skin barrier.the hyaluronic acid molecules are extra small, so that the serum can penetrate deeper into the skin - to store the moisture for a long time.main ingredients and what they do:. hyaluronic acid adds moisture and protects the skin against moisture loss.. amino acids help maintain smooth and healthy skin and also work to prevent aging.. ceramides counteract dryness and strengthen the skin barrier.this serum is suitable for all skin types, even sensitive skin