COSRX The Hyaluronic Acid 3 Serum – 3% Hyaluronic Acid Moisturizing Serum
COSRX The Hyaluronic Acid 3 Serum is a concentrated moisturizing serum designed for skin lacking moisture and experiencing dryness. Its concept is clear from the name: the number 3 refers not to a system of several types of acids, but to a 3% concentration of hyaluronic acid. The formula is designed to deliver a more intense feeling of hydration while retaining the lightweight texture expected of a serum rather than replacing a moisturizer.
Hydration complemented by a system of skin-compatible components
What sets this serum apart is not only its high concentration of sodium hyaluronate, but also its combination with components that mimic the skin’s natural moisturizing factors, along with barrier-supporting lipids. In other words, COSRX offers more than a moisture-binding ingredient: it follows a three-pronged approach to hydration—attracting moisture, helping maintain comfort in the stratum corneum, and complementing the formula with components important to the skin barrier. This thoughtful structure makes it a more considered moisturizing serum than a gel based solely on hyaluronic acid.
- 3% sodium hyaluronate: the formula’s key ingredient, helping the skin retain moisture and providing a fuller, more elastic skin feel.
- NMF amino acid complex: serine, alanine, glycine, proline, PCA, sodium PCA, and sodium lactate complement the skin’s natural moisturizing factor system and help reduce feelings of tightness.
- Barrier-supporting lipids: ceramide NP is combined with cholesterol, phytosphingosine, and fatty acids—components that contribute to a softer, less dry-feeling complexion.
The serum has a lightweight, softly silky texture: once applied, it forms a smooth layer of hydration, absorbs quickly, and leaves the skin feeling elastic and lightly moisturized rather than greasy. In a typical routine, it fits naturally into the serum step before moisturizer. It will appeal most to those looking for noticeable hydration without a rich cream texture—especially when the skin seems to have lost its comfort but you do not want a heavy finish.
Usage
After cleansing your face, apply a small amount of COSRX The Hyaluronic Acid 3 Serum evenly onto your skin, focusing on areas that need extra hydration. Gently pat the serum into your skin for better absorption and follow with your favorite moisturizer to lock in the moisture. For best results, use the serum twice daily, in the morning and evening, as part of your skincare routine.
Ingredients
Aqua, Butylene Glycol, Propanediol, Glycerin, Sodium Hyaluronate (3%), Pentylene Glycol, 1-2-Hexanediol, Diethoxyethyl Succinate, Sodium Polyacryloyldimethyl Taurate, Betaine, Xanthan Gum, Dimethicone, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Sodium PCA, Sodium Lactate, PCA, Glyceryl Acrylate/Acrylic Acid Copolymer, Hydrogenated Lecithin, Ethylhexylglycerin, Serine, Alanine, Glycine, Sodium Phytate, Sorbitan Isostearate, PVM/MA Copolymer, Glutamic Acid, Citric Acid, Lysine HCl, Threonine, Arginine, Sodium Methyl Stearoyl Taurate, Proline, Ceramide NP, Cholesterol, Caprylic/Capric Triglyceride, Phytosphingosine, Stearic Acid, Oleic Acid, Alcohol, Tocopherol, Lactic Acid, Caprylyl Glycol, Caprylhydroxamic Acid
The manufacturer is responsible for the product’s ingredients. Due to possible changes, we always recommend checking the ingredient list directly on the packaging.



In today's cosmetics market, where labels often resemble pages from a chemistry textbook, Cosrx Cosmetics stands out with its simple yet astonishingly effective approach. Their products contain only carefully selected active ingredients:
However, Cosrx Cosmetics cares not only for your skin but also for the planet. All their products are manufactured following the highest quality standards, without cruel animal testing. Additionally, the brand actively strives to reduce packaging waste and promotes sustainable production practices. Isn't it reassuring to know that your chosen cosmetics contribute to a cleaner planet? It's a double benefit—your skin glows, and the world becomes a little better.








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