How to Read a Skincare Ingredient List (And What Brands Hide)

The back of a skincare bottle is the most-honest part of the product. The front is marketing. The back is regulation. Once you can read the ingredient list — what’s called the INCI list — you can see past the front-of-bottle claims to what’s actually in the formula.

This is the practical guide. Five minutes of reading; useful for the rest of your skincare-buying life.

INCI basics: what the list actually is

INCI stands for International Nomenclature of Cosmetic Ingredients. It’s a globally standardised naming system for cosmetic ingredients, maintained by the Personal Care Products Council. The same ingredient appears with the same INCI name on a bottle in Australia, the US, the UK, France, or Japan — which is why you can compare formulas across brands and across countries.

The INCI list is required on cosmetic products in Australia under the Cosmetic Standard 2007. Every cosmetic sold here has to publish:

• All ingredients listed in descending order of concentration down to 1%
• Ingredients below 1% can be listed in any order
• Colourants listed at the end, with a ”+/-” notation if they vary by shade
• Allergens (fragrance components like linalool, limonene) listed separately by name if present

Once you know the rules, the list becomes a spec sheet you can read.

Order matters (sort of) — why

The “descending order down to 1%” rule is what makes the list useful.

The first three or four ingredients are the heavy lifters by weight. In most water-based products (serums, lotions, moisturisers), ingredient one is Aqua (water). After that come the humectants (glycerin, propylene glycol, butylene glycol), the active heroes (high-concentration peptides, niacinamide, vitamin C), the texturising agents (carbomer, xanthan gum), and the emollients (squalane, caprylic/capric triglyceride).

Anything before the preservative — typically Phenoxyethanol in modern formulations — is at meaningful concentration. Anything after the preservative is in the “below 1%” zone, and brands are allowed to list those in any order they like.

This means a peptide listed before phenoxyethanol is at meaningful concentration. A peptide listed after phenoxyethanol is below 1% — and for most peptides, below the dose the ingredient research used.

That single rule lets you read past most marketing claims.

The “fairy-dust” position

“Fairy-dusting” is the cosmetic-chemistry term for adding an ingredient at a concentration low enough to legally appear on the front of the bottle, but too low to do what the front of the bottle implies.

The fairy-dust position is at the bottom of the ingredient list — after the preservative, mixed in with colourants and fragrance components. A brand can write “with hyaluronic acid” on the front and have hyaluronic acid in the list, while the actual concentration is too low to deliver meaningful hydration.

How to spot fairy dust:

The named hero ingredient appears after phenoxyethanol or another common preservative.

The named hero ingredient appears among colourants, fragrance components, or chelating agents like disodium EDTA.

The brand publishes the ingredient list but won’t tell you the percentage when you ask.

A 200 ml moisturiser at $15 is making big claims about a $40-per-gram active. The maths usually doesn’t add up.

This is the single most common stretch in mass-market skincare. It’s also the easiest to catch once you know where to look.

Hidden actives in disguise

Some ingredients are listed under names that don’t match the marketing claim. Common patterns:

Peptides under their full INCI name. Matrixyl 3000 is “Palmitoyl Tetrapeptide-7” and “Palmitoyl Tripeptide-1” on the INCI list. GHK-Cu is “Copper Tripeptide-1.” Argireline is “Acetyl Hexapeptide-8.” A brand that says “with peptide complex” without naming the peptide is hiding which peptide it actually is.

Vitamins under their chemical names. Vitamin C is “Ascorbic Acid” or one of several derivatives (Sodium Ascorbyl Phosphate, Magnesium Ascorbyl Phosphate, Tetrahexyldecyl Ascorbate). The derivative matters — the form determines stability and bioavailability. Vitamin E is “Tocopherol” or “Tocopheryl Acetate.” Niacinamide is straightforward — it’s listed as Niacinamide.

Botanical ingredients under Latin names. Aloe vera might be “Aloe Barbadensis Leaf Juice.” Green tea is “Camellia Sinensis Leaf Extract.” These are real and standardised; they’re just less recognisable than the marketing names. Brands that list common names alongside the Latin (e.g. “Aloe Barbadensis (Aloe Vera) Leaf Juice”) are being more transparent than brands that hide behind the Latin.

Sunscreen actives. SPF actives have specific names — Zinc Oxide, Titanium Dioxide, Octocrylene, Octinoxate, etc. The protection level depends on the active and its concentration; the SPF rating on the bottle is the integrated outcome.

The pattern: if the front of the bottle uses a marketing name, find the INCI version on the back to verify it’s actually present at concentration.

The 5-second test for any product

A practical test you can run in 30 seconds in a pharmacy aisle:

Step 1: Look for the hero ingredient on the INCI list. Brand says “with retinol” — find Retinol or Retinyl Palmitate on the list. “With niacinamide” — find Niacinamide. “With Matrixyl 3000” — find Palmitoyl Tetrapeptide-7 and Palmitoyl Tripeptide-1.

Step 2: Find the preservative. Phenoxyethanol is the most common; sometimes you’ll see Methylparaben, Propylparaben, Sorbic Acid, or others. The position of the preservative is the boundary between meaningful concentrations (above) and trace concentrations (below).

Step 3: Compare positions. If the hero ingredient is before the preservative, the formula is plausibly delivering on the claim. If the hero is after the preservative, you’re looking at fairy dust.

This isn’t perfect — some highly active ingredients are used at well below 1% by design (most retinoids, for example). But for hero peptides, hero antioxidants, and hero humectants, the test works most of the time.

Why we publish full INCI on every Aperture Skin page

We publish the complete ingredient list — in INCI order, every ingredient, no abbreviations — on every product page. We do this for two reasons.

Reason one: it’s the right answer to the customer’s question. The full ingredient list is what tells you what’s in the bottle. Hiding it (or publishing only the headline ingredients) is a brand decision to obscure. We don’t want to make that decision.

Reason two: it’s a discipline check on the formula. When a brand publishes its full INCI list, the formula has to stand up to scrutiny. Customers can compare it to other brands, look up unfamiliar ingredients, see whether the headline active is in a meaningful position. Operating with that level of transparency forces the product team to make formula choices that hold up.

Going forward, when we change a formulation, we’ll publish the new INCI list and explain what changed and why. We treat the ingredient list as part of the brand’s accountability to the customer.

A note on what’s missing from this guide

This guide is about reading what’s there. It doesn’t tell you whether each ingredient is good or bad — that’s a more involved question, and “good” depends on your skin type, sensitivities, and goals.

What it does give you is the ability to verify a brand’s marketing claims against its actual formulation. Once you can do that, you can have an informed opinion about whether to trust a brand’s other claims — about clinical proof, about their environmental story, about their pricing.

The Aperture Skin take

Every Aperture Skin product publishes its full INCI list on the product page. The hero peptides — Matrixyl 3000 (Palmitoyl Tetrapeptide-7 and Palmitoyl Tripeptide-1), Argireline (Acetyl Hexapeptide-8), GHK-Cu (Copper Tripeptide-1) — are listed in their meaningful position above the preservative. We don’t add hero ingredients in trace amounts to make claims work; we use them at concentrations the published research uses.

When you’re shopping skincare elsewhere, the five-second test above works most of the time. When in doubt: more transparency is a good signal, less transparency is a flag.

Further reading

• The Complete Guide to Peptides in Skincare (2026)
• What Is Matrixyl 3000? The Peptide Behind the “Plumper Skin” Claims
• What Skincare Brands Mean When They Say ‘Clinically Proven’

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This article is general information, not personalised skincare advice. Aperture Skin products are cosmetics intended to support the appearance of healthy-looking skin. They are not therapeutic goods and are not intended to treat, cure, or prevent any condition.