The Hyaluronic Acid 3 Serum


Low molecular 3% hyaluronic acid #DewyDermSerum

What it is :  

Low molecular hyaluronic acid for maximum moisture absorption for intense hydration and skin barrier protection.

Why It's Special: 

Low molecular weight to penetrate deep into the skin  The small particles of low-molecular weight hyaluronic acid ensures moisture is better absorbed leaving dry and dehydrated skin dewy with hydration

Highly Concentrated 3% hyaluronic acid for intense hydration High strength formula infused with 3% hyaluronic acid, an active ingredient capable of absorbing up to 1,000 times its weight in water, to provide intense, skin plumping hydration

Natural moisturizing ingredients for healthy hydration · Strengthens skin barrier NMF (Amino acid complex) creates an environment similar to natural moisturizing factors in the skin to deliver healthy hydration

Multi-use serum with hydrating formula This serum can be combined with any ingredient for multi-use with diverse products.

Size: 20 mL / 0.67 fl. oz

Product FAQ

After cleansing, during the serum phase, apply a few drops to the skin. Use fingertips to gently massage and absorb the serum, starting from the inside of the face and working towards the edges. * Can be used morning and/or evening.

[Key Ingredients]

▶ Hyaluronic Acid
- Strong water retention ability that binds up to 1000 times its weight in moisture
- Recharges the skin with hydration alleviating dryness and restoring the skin's moisture balance

▶ NMF (Amino acid complex)
- Maintains hydration in the skin
- Improves skin barrier protecting against dryness and dehydration

▶ Ceramide
- A lipid component that makes up the skin barrier to improve skin barrier function
- Protects the skin from external stressors
- Prevents the evaporation of hydration

[Full Ingredients]
Water, 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

Customer Reviews

Based on 7 reviews
Costs twice as much as the Triple Hyaluronic Ampoule, but isn't any better

I was an avid user of the Triple Hyaluronic Ampoule, and was excited to try this new product. You get only half as much product for the same amount of money. It lasted literally only 2 weeks, even tho I used the exact same amount every day as I did the Triple Hyaluronic Ampoule (which usually lasted me about 6 weeks). I don't know wtf is up with that. Not to mention, the quality is like....just the same? It's not any better than the other one, and costs so much money relative to the original, I honestly don't see the point. I'm going back to the Triple H Ampoule from here on out.


I received this for free after filling a survey, and have been using it every morning. I layer rose water under and over it to maximize the liquid the hyaluronic acid can absorb, and it almost feels like a gel moisturizer by the time I'm done! That all said, if you are only looking for one product with hyaluronic acid I think that COSRX's snail mucin line is the tiniest bit better, but for those who don't like those products for whatever reason this is definitely a near-equal alternative!

Luxurious Feel

I just finished my first bottle of this serum and I really love it! It's my first hyaluronic acid serum and I am hooked. I really liked the feel of this serum, it has a thick texture that feels luxurious and makes my face feel really smooth. I like that it also has ceramides. I think it helped reduce the redness of my face. Overall I enjoyed using this serum even though it is pricey for the amount you get. I used this in the morning. The other Cosrx products in my routine are the snail mucin essence and cream.

Monika Zdobinska
Plump skin

Love it! But firts thing first, I was really excited when I saw COSRX launching HA serum, because such product was missing in their line. The HA 3 serum is simply great! The consistency is in the middle between watery and thick one, and fells very gently on the skin. I appreciate that the product is scentless. I have very sensitive skin, using this twice a day and it does its magic. My skin feels nicely nourished and hydrated and bright. I definitely recommend to try this product to everyone. You can’t go wrong with HA in your skin routine.

Primrose Tricker-O’Dell
I thought my skin looked great BEFORE I tried this….

I haven’t tried a hyaluronic acids serum before, and I was given a bottle to try for survey participation. I mostly use Cosrx products in my daily skincare regimen, items from the snail and cica collections.

I have to say, this serum is amazing. I have sensitive, combination skin that’s also prone to redness (fitzpatrick skin type 2.) Using it twice a day with the rest of my regular regimen has almost eradicated any redness, smoothed my skin texture, and seems to have balanced my oily and dry zones (hormonal breakouts notwithstanding.)

If you haven’t tried a hyaluronic acid serum yet, DEFINITELY try this one. My stupidly sensitive skin is totally happy with it and looks even better for it. 10/10 have already recommended it to everyone I know!