COSRX The Hyaluronic Acid 3 Serum is a focused hydrating serum delivering 3% hyaluronic acid to quickly plump, smooth, and restore comfort to parched, tight skin.

What It Is

This serum positions itself as a no-frills, highly effective hydration booster in the Korean skincare landscape. It addresses common skin concerns like dehydration, tightness, and dullness, distinct from more complex serums targeting aging or brightening. Compared to something like Torriden's Dive-In Low Molecular Hyaluronic Acid Serum, COSRX provides a slightly higher concentration of HA, focusing on immediate surface plumping and a straightforward ingredient list for compromised barriers. It's a foundational step for nearly any routine needing a hydration boost.

Key Ingredients

• Hyaluronic Acid (3%) & Sodium Hyaluronate: These humectants attract and hold up to 1,000 times their weight in water from the atmosphere, binding it to the skin's surface for immediate plumping and hydration.
• Glycerin: A classic, highly effective humectant that draws moisture into the skin, supporting the hydrating effects of hyaluronic acid and enhancing overall skin suppleness.
• Panthenol (Vitamin B5): Known for its soothing and restorative properties, panthenol helps calm irritation, reduce redness, and strengthen the skin's barrier function, improving moisture retention.
• Allantoin: A gentle, non-irritating ingredient that helps to soothe, heal, and protect the skin. It promotes cell proliferation and encourages healthy tissue formation.
• Betaine: A naturally occurring amino acid derivative, betaine acts as an osmolyte, helping cells maintain their water balance and protecting against dehydration, contributing to a smoother texture.
• Arginine: An amino acid with antioxidant properties, arginine also aids in skin hydration and helps to support the skin's natural healing process.

This formula prioritizes hydration and barrier support with minimal potential irritants, focusing on core humectants and soothing agents. It's free from fragrance, essential oils, and drying alcohols, formulated likely around a physiological pH (5.5-6.5) to maintain skin health. The concise list is a deliberate choice for sensitive or reactive skin types.

Who It's For

How To Use

1. When in routine: After cleansing and toning, before heavier serums or moisturizers, AM and PM.
2. How much: Two to three drops are sufficient for the entire face.
3. How to apply: Gently press or pat into the skin, avoiding harsh rubbing, until absorbed.
4. What to layer next: A hydrating moisturizer or facial oil to seal in the moisture.
5. Frequency: Daily, both morning and evening for consistent hydration benefits.

Frequently Asked Questions

Is this serum sticky or heavy on the skin?

No, despite its potent hydration, the serum has a lightweight, fast-absorbing texture that penetrates quickly without leaving a sticky or tacky residue. It feels comfortable under subsequent layers.

Can I use this serum if I have sensitive skin?

Yes, the COSRX The Hyaluronic Acid 3 Serum is formulated with a minimal ingredient list, free from common irritants like fragrance and essential oils, making it suitable for sensitive and reactive skin types.

Does this product contain any fragrance?

No, this serum is entirely fragrance-free, making it an excellent choice for those sensitive to scents or prone to irritation from fragranced skincare products.

Will this serum help with fine lines and wrinkles?

By deeply hydrating and plumping the skin, the hyaluronic acid in this serum can temporarily reduce the appearance of fine lines and make the skin look smoother and more supple. Consistent use supports overall skin elasticity.

Pairs Well With

To complete a hydrating and strengthening routine, consider pairing this serum with a gentle, low pH cleanser to maintain skin's natural barrier. Follow with a ceramide-rich moisturizer to lock in the serum's hydration and further support barrier function, like the Illiyoon Ceramide Ato Concentrate Cream. For an extra boost, integrate a propolis or snail mucin essence before the serum to enhance repair and overall skin resilience.