COSRX - The Hyaluronic Acid 3 Serum (20ml)

COSRX The Hyaluronic Acid 3 Serum is the concentrated 20ml version of the brand's hydration step — three molecular weights of hyaluronic acid in a small bottle, and worth comparing carefully against the 100ml essence before you choose.

The Hyaluronic Acid 3 Serum at a glance

Three molecular weights, and the 20ml question

Using several sizes of hyaluronic acid molecule is a sound formulation idea rather than pure marketing. Larger molecules stay near the surface and form a hydrating film; smaller ones sit within the upper layers. Spreading the range gives a more even result than a single weight does, and most well-made HA products now do it.

The more useful question is size. This is 20ml. The Hyaluronic Acid Hydra Power Essence is 100ml for a comparable price, and both are doing fundamentally the same job — binding water at the skin surface. If you want everyday hydration to use generously, including on the neck, the 100ml essence is far better value and the honest recommendation for most people.

Choose this 20ml serum if you specifically want a more concentrated layer under a moisturiser, prefer a serum texture to an essence, or want something compact for travel.

The usage rule matters more than either choice. Hyaluronic acid is a humectant — it holds water, it does not create it. In dry, air-conditioned air, apply it to damp skin and always seal it with moisturiser. Used on dry skin and left bare, it underdelivers and can leave skin feeling tight, which is why some people conclude HA does not suit them.

How to use it

1. Apply to damp skin right after cleansing or toner.
2. Press two or three drops in rather than rubbing.
3. Follow with moisturiser immediately, before it dries down.
4. Add sunscreen every morning.

Browse the full COSRX range at EmartGCC, or the Korean serums collection.

Frequently asked questions

Should I buy this or the 100ml Hydra Power Essence?

For everyday hydration, the 100ml essence is considerably better value for a similar job. Choose this 20ml serum for a more concentrated layer, a serum texture, or travel.

Does three types of hyaluronic acid work better than one?

Modestly, yes — different molecular weights hydrate at slightly different depths, giving a more even result. It is a genuine formulation choice, not just a number on the label.

Why does my skin feel tight after using it?

Usually because it went onto dry skin, or was left unsealed. Apply to damp skin and follow immediately with moisturiser.

Do I still need a moisturiser?

Yes. A humectant holds water; a moisturiser stops it evaporating. In dry or air-conditioned air this is not optional.

Can I use it with retinol, vitamin C or acids?

Yes, with all of them. Hyaluronic acid conflicts with nothing and helps offset the dryness actives cause.

Will it help wrinkles?

It temporarily softens fine lines caused by dehydration by plumping the surface. It has no effect on established wrinkles.

How long does 20ml last?

Used twice daily, roughly four to six weeks. That short life is the main argument for the larger essence.

Buying COSRX in Kuwait

EmartGCC supplies 100% original COSRX with free standard home delivery across Kuwait, usually next day. Areas beyond Fahaheel and Jahra carry a 3 KD delivery surcharge. Cash on delivery is available, and unopened items can be returned within 14 days.