Manicure

How to Read a Nail Polish Label: Ingredients Worth Avoiding

Nail polish labels list ingredients in a standardised format. Here is how to read them — and which specific compounds to look for when comparing formulas.

Nail polish labels can look impenetrable at first — a dense column of chemical names in small print, often on a bottle no wider than two fingers. But the format is standardised, the logic is consistent, and once you understand the system, comparing two formulas takes less than a minute.

Here is the framework we use, and what we look for.

How the Ingredient List Works

Cosmetic ingredient lists in the European Union follow the INCI system: the International Nomenclature of Cosmetic Ingredients. Every ingredient must be listed using its INCI name, and they must appear in descending order of concentration — the ingredient present in the largest amount appears first.

In practice, the top five or six ingredients account for the vast majority of the formula. Everything below position ten or eleven is present in small concentrations, often under one per cent. This is useful to know because it means you can learn a great deal about a formula's character by reading just the first few lines.

Solvents: The Bulk of the Bottle

The first one or two ingredients in almost any nail polish will be solvents — most commonly ethyl acetate or butyl acetate. These evaporate when you apply the polish, carrying the other ingredients with them and leaving behind the dried film. They are generally considered low risk at the concentrations used. Their presence high in the list simply reflects their function: they make up the liquid part of the formula.

Film Formers: The Structural Foundation

Nitrocellulose appears frequently in third or fourth position. This is the primary film-forming resin — the compound responsible for creating the hard, smooth coating you see on the nail. It is not inherently harmful. Some formulators use alternative resins, but nitrocellulose remains the most common and is well-understood.

Plasticisers: Where Close Reading Pays Off

Plasticisers are added to prevent the dried film from becoming too brittle. This is where ingredient literacy becomes practically important.

Dibutyl phthalate (DBP) is a plasticiser and confirmed endocrine disruptor — it interferes with hormonal signalling. It has been banned in the European Union under the Cosmetics Regulation. However, it still appears in some imported products, particularly those manufactured outside the EU and sold online. If you see it on any label, it is sufficient reason to choose an alternative.

Camphor is a common plasticiser that is not banned, but is a known sensitiser — it can trigger allergic reactions with repeated exposure in predisposed individuals. It typically appears in the top half of the formula when present.

Triphenyl phosphate (TPHP) emerged as a DBP replacement in several "phthalate-free" formulas and is now itself under scrutiny as a potential endocrine disruptor. Its presence in a formula that is marketed as clean or free of harmful plasticisers is worth noting.

"The number on a 'free' claim tells you what has been removed. It does not tell you what has been used instead."

Resins: One Distinction Worth Making

Tosylamide/formaldehyde resin is a compound that sometimes causes concern when clients see the word "formaldehyde" in its name. It is chemically distinct from formaldehyde itself and is not classified in the same category of concern — but it is a sensitiser and is responsible for a proportion of gel and polish allergic reactions, particularly with repeated exposure. Some formulators have moved away from it. Its presence is not alarming, but for clients with sensitive or reactive skin, it is worth noting.

Colourants: Standardised and Auditable

Colour pigments in INCI-listed cosmetics appear as CI numbers — Colour Index numbers. CI 77891 is titanium dioxide (white). CI 77007 is ultramarine blue. These numbers are standardised by the European Chemicals Agency and are auditable. A quick search confirms what any given CI number represents, which makes this section of an ingredients list the most transparent and least ambiguous.

What "Free" Actually Means

Products marketed as "3-free," "5-free," "7-free," or "10-free" are indicating how many of a standard list of problematic compounds they have excluded. The list typically includes DBP, toluene, formaldehyde, formaldehyde resin, camphor, xylene, TPHP, parabens, and a few others. The higher the number, the more compounds have been excluded — but the claim is only meaningful if you know which specific compounds were on that list.

The EU Regulation Advantage

Products certified for sale within the European Union are subject to the EU Cosmetics Regulation — one of the most stringent regulatory frameworks for cosmetics anywhere in the world. It bans or restricts over 1,300 substances. By contrast, the equivalent US list bans around eleven. If you are purchasing nail polish and want a reasonable baseline of assurance about what is not in it, EU-certified products represent a higher standard by default.

We apply this standard consistently across everything we use and recommend at Maison Lumia. Reading the label is the beginning of that process — and it becomes straightforward with a little practice.