Hyaluronic Acid 2% + B5 is a water-based serum with hyaluronic acid and vitamin B5. Why It’s Special This treatment hydrates the skin and creates a smooth, supple, and plumped-up appearance. It works by replenishing moisture in multiple layers of the skin. This product contains three types of hyaluronic acid with different molecular weights, allowing it to penetrate mutiple layers of the skin for deep hydration. How to Use Apply a few drops to your face in the morning and at night before oils, moisturizers, and creams. If your skin is oily, you may not need another moisturizer. Those with dry skin may prefer to apply a heavier moisturizer over it.