Skin Republic’s Skin Booster Hyaluronic Acid 1% and 2% Niacinamide Serum works to plump dry skin with hydration. Perfect for rough, dry or flaking patches, the nourishing formula is infused with 1% hyaluronic acid as well as niacinamide. It helps to deliver long-lasting hydration while soothing and softening the skin. Powered by a high percentage of active ingredients, the hydrating serum supports a supple, healthy-looking complexion. Always do a patch test.