COSRX Sodium Hyaluronic Acid 3% Serum 20ml — Lightweight Hydrating Booster for Fine Lines & Sensitive Skin

COSRX Pure Sodium Hyaluronic Acid 3% Serum is a lightweight, fast-absorbing hydrator that delivers targeted moisture to replenish and visibly plump dry, fine-lined skin.

This compact 20ml serum combines a concentrated 3% sodium hyaluronic acid complex with ceramides and natural moisturizing factors to help restore skin moisture, reinforce the skin barrier, and smooth the appearance of dehydrated fine lines. Designed for layering under creams or makeup, the formula is fragrance-free and developed with sensitive skin in mind.

How does this serum add moisture quickly?

The core of the formula is a 3% sodium hyaluronic acid complex that attracts and holds water at multiple skin layers, delivering an immediate feeling of replenishment without heaviness. Fast penetration helps the skin surface feel softer while deeper hydration supports improved elasticity over time.

• 3% sodium hyaluronic acid complex for multi-layer moisture retention
• Lightweight, non-greasy texture absorbs quickly
• Works well alone or layered with heavier creams

Will it help reduce the look of fine lines and rough texture?

By increasing skin hydration, the serum temporarily plumps the skin, which can make fine lines appear less noticeable. Ongoing use supports smoother skin texture as moisture levels stabilize and the skin barrier becomes stronger.

• Hydration-driven plumping minimizes the appearance of dehydration lines
• Ceramides and NMFs help fortify the skin’s protective layer
• Visible improvements reported in consumer self-assessments

How should I use it within my routine for best results?

Apply 2–3 drops to clean skin on face and neck, once or twice daily. Use it after water-based toners and before heavier creams or oils to lock in moisture; it’s safe to apply near the eye area but avoid direct contact with eyes.

• Apply on cleansed skin; pat gently until absorbed
• Layer under moisturizer or sunscreen during the day
• Perform a patch test before first full-face application

Is this serum suitable for sensitive or acne-prone skin?

The fragrance-free, dermatologist-tested formula avoids common irritants and is developed to be gentle on reactive skin types. Its simple, focused ingredient set aims to hydrate without clogging pores or adding unnecessary actives that can trigger sensitivity.

• Hypoallergenic and dermatologist-tested
• Free from parabens, sulfates, phthalates, and artificial fragrances
• Non-comedogenic-friendly texture for layering in acne-prone routines

Who is this for: This serum is designed for anyone looking to boost skin hydration—especially those with dry, dehydrated, or mature-appearing skin seeking a fragrance-free, easily layered hydrator. It’s also a practical choice for sensitive or combination skin types wanting a focused humectant treatment without added actives. The 20ml size is convenient for travel, trialing a new routine, or pairing with other COSRX staples to target moisture and barrier support.