COSRX The Hyaluronic Acid 3 Serum is a scientifically formulated skincare product designed to provide intense hydration and promote skin health. The serum contains a high concentration of hyaluronic acid (HA), a glycosaminoglycan that is naturally present in the skin and plays a crucial role in maintaining skin hydration and elasticity. Hyaluronic acid is a large molecule that can hold up to 1000 times its weight in water, making it an excellent humectant for attracting and retaining moisture in the skin. In the COSRX serum, the hyaluronic acid is present in three different molecular weights, allowing for deep penetration into the various layers of the skin. This multi-molecular weight approach enhances the overall hydration and plumping effect of the serum. In addition to hyaluronic acid, the serum may also contain other moisturizing ingredients such as glycerin, panthenol, or ceramides, which further support the skin's barrier function and prevent moisture loss. These ingredients work synergistically to improve the skin's moisture content and overall hydration levels. The pH level of the COSRX serum is formulated to be skin-friendly, typically ranging between 5.0-6.0, which is within the ideal range for maintaining the skin's natural acidic barrier. This pH level helps to support healthy skin flora and prevents the growth of harmful bacteria that can lead to skin irritation or breakouts.