COSRX Sodium Hyaluronic Acid 3% Serum 20ml — Lightweight Hydrating Serum with Ceramides for Plumping & Barrier Repair

COSRX Pure Sodium Hyaluronic Acid 3% Serum is a concentrated 20ml hydrating serum designed to lock in moisture and visibly plump skin with a lightweight, non-greasy formula. COSRX blends pure 3% sodium hyaluronic acid with ceramides and natural moisturizing factors to deliver multi-layer hydration that supports a healthier skin barrier. This compact Korean skincare serum absorbs quickly, layers well under moisturizers and makeup, and is formulated without artificial fragrances, parabens, sulfates, phthalates, or animal testing. Ideal for daily use, it targets dryness, fine lines from dehydration, and rough texture by replenishing water content across surface and deeper layers.

How does this serum hydrate different skin layers?

The formulation uses a trio of hygroscopic ingredients—sodium hyaluronic acid, ceramides, and natural moisturizing factors—that attract and retain water at multiple depths. Sodium hyaluronic acid holds moisture at the surface and within skin’s matrix while ceramides support barrier function to prevent trans-epidermal water loss.

• 3% pure sodium hyaluronic acid for rapid surface and inner hydration
• Ceramides to reinforce the lipid barrier and reduce moisture loss
• Natural Moisturizing Factors (NMF) to mimic skin’s own hydration system
• Lightweight texture that layers under creams and makeup

Will this help visible fine lines and dry patches?

Hydration visibly smooths and plumps skin, making dehydration lines appear softer and less noticeable. Regular use helps fill out creases caused by moisture loss; for persistent lines, combine with a routine that supports collagen and skin renewal.

• Instant plumping effect from moisture retention
• Improves rough, flaky areas by restoring water balance
• Best used consistently—morning and/or evening—for cumulative improvement
• Pairs well with sunscreens and barrier-repair moisturizers

How should I apply the COSRX Hyaluronic 3% Serum in my routine?

Apply 2–3 drops to clean skin on face and neck once or twice daily, patting gently until absorbed. It works as a layering step: use after cleansing and toning, then follow with a moisturizer and SPF in the morning.

• Use 2–3 drops; avoid direct contact with eyes
• Apply to damp skin to maximize absorption and water-binding
• Follow with cream or oil to lock in hydration
• Patch test on body before first facial use if you have sensitive skin

Is this serum suitable for sensitive or combination skin types?

COSRX formulates this serum with minimal, skin-friendly ingredients and no artificial fragrance, making it appropriate for many sensitive and combination skin types. Because it focuses on hydration rather than actives that can irritate, it is commonly tolerated well—still, perform a patch test if you have very reactive skin.

• Fragrance-free, hypoallergenic, dermatologist-tested formulation
• No parabens, sulfates, phthalates, or animal testing
• Non-comedogenic feel suitable for layering under other products
• Patch testing recommended for highly reactive skin

Who is this for? This serum is made for anyone looking to boost hydration quickly and maintain skin moisture throughout the day—especially those with dry, dehydrated, mature, or combination skin. It’s a compact, travel-friendly 20ml serum that suits daily AM/PM routines and complements targeted treatments aimed at texture and barrier repair. If you want a simple, fragrance-free hydration step that layers easily, COSRX Pure Sodium Hyaluronic Acid 3% is formulated to be an effective core product in your skincare lineup.

FAQ

Q: How often should I use COSRX Hyaluronic Acid 3% Serum?

A: Use 2–3 drops once or twice daily—apply after cleansing and toning, then seal with moisturizer. Avoid direct eye contact.

Q: Can sensitive skin use this serum?

A: Yes, it’s fragrance-free and dermatologist-tested, but perform a patch test first if your skin is highly reactive.