# COSRX The Hyaluronic Acid 3 Serum

Hyaluronic Acid Serum, 20 ml, led by Sodium Hyaluronate.

- Brand: COSRX
- Product: The Hyaluronic Acid 3 Serum
- Price: $21.99
- Availability: Out of stock
- Size: 20ml
- Market: Korean market, the version sold in Korea
- Made in: Republic of Korea
- EAN (barcode): 8809598454668
- Category: Serums & Ampoules

## Key benefits

- Sodium hyaluronate is fifth on the list, ahead of the amino acid blend
- COSRX's own product name states 3%; the ingredient list itself declares no percentage
- Ceramide NP, cholesterol and phytosphingosine round out a barrier-supportive base further down the list
- A small amount of lactic acid sits near the end for mild surface exfoliation, not a treatment-level dose
- Watery texture built to layer, not to replace a moisturizer
- 20 ml, a layering-serum size rather than an all-over daily pour

## How it works

Hydration is a layering job, and this is the water step that sits between toner and moisturizer. It goes on damp skin so the layer above it has something to hold, and the cream over the top is what keeps it there. Skin that drinks a moisturizer and still feels tight an hour later is usually short of water rather than oil, and that gap is what this step is for. It is a daily step, morning and evening, and it layers under anything else already in the routine. In the morning it goes under sunscreen, and at night under whatever cream finishes the routine.

## How to use

1. Use the Hyaluronic Acid 3 Serum after toner and before moisturizer, morning and evening, on skin still damp from the step before.
2. Three or four drops covers the whole face. Press it in with flat palms instead of rubbing it around.
3. Toner first, this second, then moisturizer over the top within a minute, while the layer underneath is still damp.
4. Twice a day, every day. Do not leave it bare on the skin with nothing over it; a water layer with no cream on top gives most of that water back to the air.

## Ingredients

Water, Butylene Glycol, Propanediol, Glycerin, Sodium Hyaluronate, 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

## FAQ

### What is the actual sodium hyaluronate content in this Hyaluronic Acid 3 Serum?

Sodium hyaluronate sits fifth on the ingredient list, right after the water, butylene glycol, propanediol and glycerin base, though the list itself declares no percentage there, and the 3% figure comes from the product name only. Ceramide NP, cholesterol and phytosphingosine appear further down the list as a barrier-supportive trio, and a broad amino acid set rounds out the formula. This is a 20 ml bottle sized for layering rather than an all-over daily pour.

### Is this serum suitable for dry, barrier-compromised skin?

Ceramide NP, cholesterol and phytosphingosine appear together on the list, the same three-lipid combination often chosen to support a weakened barrier, alongside sodium PCA and sodium lactate. Fragrance, essential oil, paraben and mineral oil are all absent from the list. That reads as a generally barrier-friendly formula, though skin under active irritation should still be patch tested before adding it to a routine.

### Does the hydration from this serum last, or fade if I stop using it?

Humectants such as sodium hyaluronate hold onto water present in the skin rather than making a lasting structural change, so the plumped feeling recedes gradually if the serum is dropped from a routine. Consistent daily use keeps the amino acids and barrier lipids working alongside it. This works as an ongoing habit rather than a step that produces a permanent result on its own.

### Can I use this alongside a pore-focused or retinoid product?

The formula here is built from humectants, amino acids and barrier lipids, none of which inherently conflict with a separate pore-focused or retinoid step in the same routine. A common order is toner, this serum on damp skin, then any treatment product, followed by moisturizer. Check the other product's own label for its specific layering instructions before combining the two.

### How do I confirm this 20 ml bottle is the authentic Korean-market formula?

This unit's barcode, 8809598454668, is the original Korean-market code, not a substitute applied for US retail.

---

Page: https://korean-pharmacy.com/products/cosrx-the-hyaluronic-acid-3-serum