Casida Vitamin C Serum – Glow & Freshness for Your Skin The Casida Vitamin C Serum with Hyaluronic Acid provides a visibly radiant, even complexion. The highly concentrated formulation combines Vitamin C as an antioxidant with moisturizing Hyaluronic Acid – for a vital, well-cared-for skin appearance with a natural glow. Light, Effective & Natural The serum absorbs quickly without being sticky and