Why the INCI List Is a Regulatory Document, Not Marketing Copy

Under EU Cosmetics Regulation EC 1223/2009, every cosmetic product sold in the European market must display its ingredients using the International Nomenclature of Cosmetic Ingredients system, listed in descending order of weight concentration. This is not a voluntary transparency gesture — it is a legal requirement with specific structural rules that, once you understand them, turn every label into a fairly legible formula summary.

The regulation creates a two-zone structure: above the 1% threshold, ingredients appear in strict descending order by concentration. Below 1%, brands may list in any order they choose. This single rule explains an enormous amount about why certain ingredients appear where they do — and why a beautifully marketed “key ingredient” listed in position 22 of 24 is, by definition, present at a concentration that likely has limited functional effect on the skin.

The INCI list is one of the few places in cosmetics where the law requires honesty about what is actually in the bottle — and most consumers do not know how to read it.

Transparency as brand architecture is not a trend phrase. It describes a specific design decision: whether a brand structures its communication around what the formula actually does, or around what consumers want to believe it does. The INCI list makes that distinction visible, if you know where to look. The Slides below help you to understand.

Seven Slides on INCI Structure

7 Slides on INCI Structure
Slide 01 / 07
That ingredient list is not random. It is a map.

Every INCI list follows a specific legal structure. Once you know the rules, you can read any formula in about 30 seconds.

Scroll down to learn the five things worth looking for.

Slide 02 / 07 — The Descending Order Rule
Above 1%: the law says they must be honest.

EU Regulation EC 1223/2009 requires every ingredient present at more than 1% concentration to be listed in descending order by weight. The first ingredient is the most abundant. The second, slightly less. And so on.

This means position in the list is a concentration signal — not a prestige signal.

01. Aqua
02. Glycerin
03. Niacinamide
04. Butylene Glycol
05. Pentylene Glycol
↓ still above 1% threshold
Each ingredient above the 1% line is telling you something real about the formula’s weight distribution.
Slide 03 / 07 — The 1% Threshold
After a certain point, the order stops meaning anything.

Once you pass the 1% threshold, brands can list remaining ingredients in any order they like. This is where most “active” ingredients tend to live — retinol, peptides, botanical extracts — often present at 0.1% to 0.5%.

That is not necessarily a problem. Some actives are effective at low concentrations. But it does mean you cannot use position alone to judge how much of something is present once you are in the lower half of the list.

Above 1% — ordered by law Below 1% — any order
The 1% line is rarely marked on the label. Learning to estimate it takes practice — but glycerin and butylene glycol as adjacent entries is often a useful landmark.
Slide 04 / 07 — What “Aqua” at Position One Tells You
Water first means the formula is water-based. That has consequences.

When Aqua appears first, the primary delivery medium is water. This affects how actives are dissolved and delivered, how the formula interacts with the skin barrier, and — critically for European users — how it behaves in high-mineral content tap water environments.

In Germany, the Netherlands, and parts of the UK, tap water TDS can reach 300–400 mg/L. Hard water deposits calcium and magnesium ions on the skin surface after rinsing. A water-based formula applied to a skin surface already coated in mineral residue will behave differently than the same formula applied to mineral-free skin.

Aqua = primary solvent + delivery medium
Formula is water-continuous phase
pH balance possible
Hard water interaction relevant
An anhydrous formula (one starting with an oil or wax) will list no Aqua. That signals a fundamentally different product architecture — occlusive rather than hydrating.
Slide 05 / 07 — Where to Find the Preservatives
Preservatives are always near the end. That placement is structural, not incidental.

Because preservatives are effective at very low concentrations — typically 0.1% to 1% — they almost always appear in the lower portion of the INCI list. EU Annex V of EC 1223/2009 restricts which preservatives are permitted and at what maximum levels. Common examples include phenoxyethanol (max 1%), sodium benzoate, and ethylhexylglycerin.

Seeing phenoxyethanol near position 18 of 22 is expected and not a cause for concern. Seeing it near position 4 would be unusual and worth noting.

18. Carbomer
19. Sodium Hydroxide
20. Phenoxyethanol ← preservative zone
21. Ethylhexylglycerin ← often paired
22. Parfum / CI colorants
Phenoxyethanol and ethylhexylglycerin are frequently listed together because they work synergistically — the glycerin ester disrupts microbial cell membranes while phenoxyethanol inhibits intracellular enzyme function.
Slide 06 / 07 — How to Identify Fragrance
“Parfum” is one word. What it conceals can be twenty compounds or more.

EU regulation permits fragrance components to be listed collectively as Parfum or Fragrance — a formulation protection exception that has survived multiple rounds of regulatory debate. However, since 2005 and updated in 2023 under SCCS guidance, 26 specific allergens must be declared individually if present above 0.01% in rinse-off products or 0.001% in leave-on products.

So if you see both “Parfum” and individual compound names like Linalool, Limonene, Geraniol, or Benzyl Alcohol listed separately near the end of an INCI, those are fragrance allergens being disclosed above threshold — not additional functional ingredients.

21. Parfum
22. Linalool ← fragrance allergen disclosure
23. Limonene ← fragrance allergen disclosure
24. Citronellol ← fragrance allergen disclosure
A formula listing only “Parfum” with no subsequent allergen declarations either contains no allergens above threshold, or is a fragrance-free formula with a masking agent — worth confirming if you have sensitised skin.
Slide 07 / 07 — Your Turn
Pick up the nearest product. Find the INCI list.

Where does Aqua appear. Where does the order likely shift below 1%. Where are the preservatives. What is listed after Parfum.

You now have the framework. The list will tell you the rest.

What This Means for European Consumers and Hard Water Climates

Reading an INCI list as an informed European consumer requires one additional layer of context that most global skincare content ignores: the environment the product is being used in. A serum formulated and tested in Seoul — where tap water is notably softer than Berlin, Amsterdam, or London — may behave differently once it enters a hard water skincare routine. This is not a defect in the formula. It is a use-context consideration that the INCI list can help you anticipate.

Specifically, water-soluble humectants like sodium hyaluronate that appear in positions 5 through 10 of an INCI list are present at meaningful concentrations and will interact with the water activity on the skin surface. In low-humidity Central European winter interiors — where indoor relative humidity commonly drops to 20–40% due to central heating — a humectant-heavy formula without adequate occlusive support will draw moisture toward the skin surface and potentially lose it to the dry air before the barrier layer has a chance to trap it. The INCI list tells you the ratio of humectants to occlusives, which tells you whether the formula was designed for that environment.

Sodium Hyaluronate
SODIUM HYALURONATE
The sodium salt form of hyaluronic acid. Smaller molecular weight than hyaluronic acid itself, allowing deeper penetration into the stratum corneum. Functions as a humectant by binding water molecules — roughly 1000x its own weight in optimal humidity conditions. In low-humidity environments (below 40% RH, common in German winter interiors), humectant draw can work in reverse, pulling moisture from deeper skin layers toward the dry air surface. Most effective when paired with an occlusive in the same routine step. Typically effective at concentrations from 0.1% upward; position in INCI list will indicate whether the formula is using it at functional or cosmetic labelling levels.

This is precisely what transparency as brand architecture means in practice. A brand that lists sodium hyaluronate at position 18 out of 24 and markets the product as a “hyaluronic acid serum” is making a communication choice that the INCI list quietly contradicts. A brand that lists it at position 5, then follows with a ceramide complex and a light occlusive, is showing you a formula designed to actually perform in dry, cold, centrally-heated European rooms. The list is the architecture. The marketing is the facade.

For Korean skincare specifically, this structural literacy matters more than most product content communicates. Korean formulation culture has historically prioritised texture elegance and layering logic — the assumption that products will be used in a specific sequence that builds from hydration to sealing. When that logic is transferred directly to a European winter routine without adaptation, the humectant layers often lack sufficient occlusive conclusion. Reading the INCI list of each product you are layering helps identify whether you are building toward a sealed barrier or leaving it exposed to evaporation.

If you want to go deeper on how ceramide ratios in Korean moisturisers compare to European pharmacy staples, the formulation logic is covered in detail in our ceramide moisturiser guide for European skin types. For a working explanation of why low molecular weight hyaluronic acid behaves differently from the full-length polymer under European indoor humidity conditions, see our hyaluronic acid and low humidity analysis. And if the preservative zone of your INCI list contains something you do not recognise, the EU cosmetics regulation ingredient reference breaks down Annex V permitted preservatives with concentration limits.

Frequently Asked Questions

What does it mean when an ingredient appears very low on the INCI list?
For ingredients above the 1% threshold, a low position means a lower concentration by weight compared to ingredients listed earlier. For ingredients below 1%, position is not legally regulated and tells you nothing about relative concentration — brands can arrange them in any order. This is where many marketed “active” ingredients sit, at concentrations between 0.01% and 1%.
How can I find the 1% threshold in an INCI list if it is not marked?
There is no visual marker. However, certain ingredients appear reliably at or just above the 1% level in most formulas — glycerin, butylene glycol, and pentylene glycol are common landmarks. When you see these transitioning into functional actives like niacinamide or centella extracts, you are likely near or just past the threshold. Carbomer (a thickener) and allantoin often appear near the 1% boundary as well.
Is “Parfum” on an INCI list always a concern for sensitive skin?
Not automatically. Parfum indicates a fragrance blend is present, but the relevant question is whether specific allergens are declared separately after it. Under EU regulation, 26 fragrance allergens must be listed individually if present above defined thresholds in leave-on products. A Parfum entry with no subsequent allergen names suggests the formula either contains no regulated allergens above threshold or uses a minimal masking agent. If you have a known fragrance sensitivity, cross-reference the individual allergen list rather than treating “Parfum” as a binary signal.
Does the INCI list apply to Korean skincare products sold in Europe?
Yes. Any cosmetic product legally sold in the EU must comply with EC 1223/2009, including the INCI labelling requirement. Korean brands selling through European distributors or directly to EU consumers are required to format their ingredient lists according to this standard. If a product imported from Korea does not carry an EU-format INCI list, it has not been formally registered through the EU Cosmetic Product Notification Portal and is technically non-compliant for sale in the EU market.