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The encyclopedia

A growing ingredient guide, in plain English.

Explore commonly discussed skincare ingredients, what available evidence suggests, where uncertainty remains and which Skin Grocer products contain them.

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Ingredient questions

PDRN, cica, niacinamide, snail mucin — what they actually do.

The ingredient questions Australians search for most, answered without the marketing language.

What is PDRN in Korean skincare and what does it do?

PDRN stands for polydeoxyribonucleotide. In skincare, the name generally refers to DNA-derived fragments used in cosmetic formulations. Some early research and manufacturer testing explore appearance-related hydration and elasticity outcomes, but independent evidence for topical skincare remains limited.
  • Evidence strength: EMERGING — limited independent topical evidence.
  • Topical cosmetic products are not equivalent to injectable medical treatments.
  • Product performance depends on the complete formula — not the hero ingredient alone.
  • Results should not be guaranteed.
  • Customers receiving procedures should follow their treating professional’s aftercare advice.

What is centella asiatica (cica) and who is it for?

Centella asiatica, sold in Korea as "cica", is a herb whose extracts (madecassoside, asiaticoside) are used to calm visible redness and support barrier recovery. It suits sensitive, reactive, post-acne and sunburn-prone skin, and it layers safely with almost everything else.

What does niacinamide do, and how much is too much?

Niacinamide is vitamin B3. It helps with uneven tone, visible pores, oil balance and barrier function. Most Korean formulas sit between 2% and 5%, which suits daily use; 10% and above can sting sensitive skin without adding much benefit.

Does snail mucin actually work?

Snail secretion filtrate is a hydrating, film-forming ingredient rich in glycoproteins and hyaluronic acid. It is genuinely good at making skin feel plump and comfortable and may help support the appearance of post-acne marks, but it is a hydrator and soother, not an anti-ageing active on its own.

What is the difference between hyaluronic acid molecular weights?

High molecular weight hyaluronic acid sits on the surface and holds water there; low molecular weight forms travel further into the upper layers for longer-lasting plumpness. Korean serums often use a multi-weight complex so you get both immediate surface hydration and deeper water retention.

Where do K-beauty plant ingredients come from?

Most trace back to Korean and East Asian traditional medicine. Wild ginseng was traded and paid as tribute for over a thousand years, and farmed cultivation took hold in the Joseon era; heartleaf (houttuynia cordata) was a folk remedy for inflammation and now anchors calming lines; mugwort (ssuk) was used in baths and teas and is now a staple soothing extract; rice ferment comes from centuries of using rice water on skin and hair.

Do I need a Korean toner if I already use a moisturiser?

A Korean toner is not the stripping alcohol toner of the 1990s — it is a watery hydration step. If your skin feels tight after cleansing or your serums pill, a hydrating toner helps; if your skin is comfortable and your routine works, it is optional.
TORRIDEN DIVE IN Soothing Cream jar standing in shallow rippling water with clear water spheres and a swatch of light blue gel-cream, in warm daylight
Products pictured are stocked Skin Grocer lines and are not presented as ranked.

The Seoul Signal

What is gaining attention in Korean skincare—and what matters here.

We examine Korean beauty-platform rankings, retail activity and customer conversations, then consider the formulas and their relevance for Australian routines.

Popularity is a signal to investigate—not proof that a product works or suits everyone.

Korea market note

Do You Need a Lighter Moisturiser for Spring?

Melbourne's afternoons are warming up, and Korea's Hwahae trending chart on 25 October reads like a texture menu: a rich barrier cream at No. 1, and two lightweight gel-creams inside the top 12. This fortnight: what actually changes when you swap to a lighter moisturiser, who should, and who shouldn't.

Last checked
Signal type
Platform ranking and aggregated customer reviews
Read the latest Seoul Signal →How we evaluate Korean-market signals →

THE INGREDIENT LIBRARY

An ingredient can start the conversation. The whole formula decides.

Korean skincare is known for thoughtful textures and ingredient combinations—not miracle extracts. Learn what familiar ingredients may contribute, where the evidence is stronger and why the complete formula matters.

Explore the ingredient library→

Evidence guideEstablished · Promising · Formula-dependent

Evidence ratings reflect the quality and relevance of available research for topical cosmetic use. They do not guarantee an individual result.

Macro photograph of a clear, viscous cosmetic essence representing the texture of a snail secretion filtrate formula.
What it is
Usually listed as snail secretion filtrate, it is a cosmetic ingredient containing a mixture of water-binding and skin-conditioning components.
Why it’s in K-beauty
It works well in lightweight essences and serums designed to layer without feeling heavy.
What it may help with
Supporting hydration, softness and a temporarily plumper appearance.
Keep in mind
Independent clinical evidence for major skin transformation remains limited. Patch test, particularly if your skin is reactive.
View products with this ingredient→

HOW WE READ A FORMULA

A trending ingredient is not enough.

Before a product reaches the Skin Grocer shelf, we consider the complete ingredient list, formula format, packaging, routine role, available evidence and who it is realistically suited to.

Read how we curate→
  • 01

    COMPLETE FORMULA

    Not one hero ingredient in isolation.

  • 02

    CLEAR ROUTINE ROLE

    The product must have a reason to exist.

  • 03

    REALISTIC EVIDENCE

    Popularity and proof are not the same thing.

  • 04

    USABILITY

    Texture, layering and the likelihood that customers will actually finish it.

  • 05

    CUSTOMER FIT

    Who it may suit—and who should approach it carefully.

THE SKIN GROCER GUIDE

Learn enough to buy with confidence.

Plain-English guidance for understanding routine order, commonly discussed ingredients and how to use products more thoughtfully.

Evidence, limitations and review dates are shown where relevant.

Explore the Learn Hub→