Kiehls Vital Skin Strength Serum 100Ml100ml A skin strengthening hyaluronic acid serum that helps protect against skin aging stressors and visibly reduce signs of aging. Strengthens skin from within its deepest surface layer Helps protect against skin aging stressors including sun exposure, pollution, stress, lack of sleep, diet and temperature that can lead to early signs of aging Visibly reduces fine lines, improves resilience and boosts radiance for glowing, healthy looking skin