COSRX Serums in Australia: PDRN, Peptides, Vitamin C, Niacinamide and Eye Patches Explained

COSRX began with a snail and a very simple promise: one ingredient, one job, no fuss. Over the years that promise has grown into a whole shelf of serums, each named for what it does. Niacinamide 15. Vitamin C 23. Hyaluronic Acid 3. It reads a little like a chemistry set, and that is exactly the point. Here is how to make sense of it.

The Beauty Desk · COSRX · 9 minute read

If you have searched for cosrx serum, cosrx pdrn, cosrx vitamin c serum, cosrx niacinamide or cosrx eye patch, this is the guide. The brand story is in our COSRX snail mucin guide, and everything is in the COSRX collection.

How COSRX names its serums

The number in a COSRX serum name refers to the main active and its concentration or form. It is a straightforward system: you can see what the product is built around at a glance. That clarity is part of why the brand became a favourite for people who like to know what they are putting on their skin.

The PDRN line

PDRN has been one of the big ingredient stories of the mid-2020s. Trend coverage describes it moving from clinic treatments into everyday skincare, and COSRX has followed with a range of its own. The COSRX 5 PDRN Collagen Intense Vitalizing Serum ($38.00) is the serum, the COSRX 5 PDRN B5 Vital Soothing Toner ($29.95) is the toner, and the COSRX 5 PDRN Collagen Vitalizing Hydrogel Eye Patch ($32.00, 60 patches) is the eye step. As with any cosmetic PDRN, think of it as hydrating and comforting rather than a clinical treatment.

The vitamin C pair

COSRX offers two. The COSRX The Vitamin C 13 Serum ($32.95, 20ml) and the COSRX Advanced The Vitamin C 23 Serum ($29.95, 20ml). The higher number means a higher concentration, which can be more demanding, so start slowly. Use sunscreen every morning.

Tone and texture serums

The COSRX The Niacinamide 15 Serum ($29.95) is the popular single-job serum for oily-looking skin. The COSRX The Alpha-Arbutin 2 Discoloration Care Serum ($32.00, 50ml) is aimed at uneven-looking tone.

Hydration and peptides

The COSRX The Hyaluronic Acid 3 Serum ($32.00) is the simple hydration serum. The COSRX The 6 Peptide Skin Booster Serum ($32.00) is a lightweight, watery booster for people who want a smoothing-feel step.

Calming serums

The COSRX Pure Fit Cica Serum ($32.00, 30ml) is the calming choice, and the COSRX AC Collection Blemish Spot Clearing Serum ($38.00, 40ml) is aimed at oily-looking skin.

The eye patches

COSRX makes three hydrogel eye patches in 60-patch packs: the Advanced Snail Hydrogel Eye Patch ($35.00), the Peptide Collagen Hydrogel Eye Patch ($32.00) and the PDRN one above ($32.00). Use them for a cooling, hydrating moment.

The golden rule: one at a time

1. Add one new serum at a time.
2. Patch test for 24 hours.
3. Do not stack several strong actives on the same night.
4. Wear sunscreen every morning.

Around Australia

• Sydney, NSW: niacinamide and hyaluronic for humid summers.
• Melbourne, VIC: peptides and ceramides in winter.
• Brisbane and the Gold Coast, QLD: vitamin C by day only with sunscreen.
• Perth, WA: hydration first.
• Adelaide, SA: swap with the season.
• Canberra, ACT: dry air; hyaluronic and a cream.
• Hobart, TAS: richer textures.
• Darwin, NT: light serums.

Where we fit in

Eastern Curlew is an authorised COSRX stockist and we dispatch from Sydney. We sell the products mentioned, so weigh our view accordingly. Prices come from the live product pages and can change.

Frequently asked questions

What do the numbers in COSRX serum names mean?
They refer to the main active ingredient and its concentration or form.

Which COSRX serum should I start with?
Many people start with Niacinamide 15 or Hyaluronic Acid 3, then add one at a time.

Is COSRX PDRN a medical treatment?
No. It is a cosmetic range best seen as hydrating and comforting.

Can I use vitamin C and niacinamide together?
Many routines do, but introduce them separately and patch test.

Where can I buy COSRX in Australia?
From Eastern Curlew, an authorised stockist, dispatched from Sydney.

This article is general information only. It is not medical advice and does not replace advice from a doctor or dermatologist. Results vary from person to person, and you should patch test new products. This guide draws on our own product pages and on published reviews, trend coverage and editorial features from Australian and international beauty and K-beauty publications and independent reviewers. Product information may change. Last checked: 10 November 2026.