How to Read an INCI List for Fragrance Allergens
Fragrance on a label can mean one word hiding dozens of compounds, plus specific allergens that must be named individually. Here is how to find them, and what the thresholds actually mean.
Fragrance labelling is where an ingredient list goes vague on purpose. Parfum or Fragrance can stand for a mixture of many compounds, none of them individually disclosed. Layered over that, regulations in the EU require specific fragrance allergens to be named in their own right when they pass set thresholds: 0.001 percent in leave on products, 0.01 percent in rinse off. Those names are the part of the list a sensitive reader can actually use.
The commonly named ones include linalool, limonene, geraniol, citral, citronellol, eugenol, and coumarin. They occur naturally in essential oils as well as in synthetic fragrance, which is why a product scented only with essential oils can still be a problem for a fragrance sensitive person, and why natural is not an answer to an allergen question.
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Start from your own list, not a general one
Allergen reading only works if you know what you react to. A patch test with a dermatologist can name specific allergens, and then the INCI list becomes a checklist you can scan in seconds. Without that, people exclude half the market on suspicion and still get caught by the compound they never identified.
Scan for your named allergens anywhere in the list, not just near the end. Allergens must be declared when they pass the threshold, but a compound can also be a deliberate ingredient in its own right, particularly in essential oil heavy formulas, where linalool or limonene can sit much higher up.
Understand what fragrance free and unscented really mean
Fragrance free should mean no fragrance material added, including masking fragrance. Unscented is weaker: it can mean a masking agent was used to neutralise a base smell, so the product has no noticeable scent while still containing fragrance compounds. For a fragrance allergic reader, that distinction is the entire purchase.
Also watch the botanical back door. Lavender oil, citrus peel oils, and other essential oils bring limonene and linalool with them, and oxidation makes it worse: limonene and linalool form stronger sensitisers as they age in contact with air. An old, half used essential oil product is a different exposure from a fresh one, even with an identical label.
A practical routine for sensitive buyers
Prefer products with short lists and no parfum entry while you are identifying a reaction. Introduce one new scented product at a time, with a two week gap, so a reaction has an obvious suspect. Keep a simple note of product, date started, and any symptoms. Memory is unreliable at exactly the delay contact dermatitis works on, often 48 to 72 hours after exposure.
If reactions keep happening despite careful label reading, that is a case for formal patch testing rather than more label reading. Labels can tell you what is declared. They cannot tell you which declared compound is your problem, and guessing wrong for a year is a common way to lose a year.
Frequently asked questions
Why is fragrance listed as just parfum?
Fragrance mixtures are treated as trade formulations, so the blend is declared as a single entry, parfum or fragrance. Specific regulated allergens are the exception: above set thresholds they must be named individually, which is the information sensitive buyers rely on.
Are essential oils safer for fragrance allergy?
No. Essential oils naturally contain major fragrance allergens such as linalool, limonene, and geraniol, and those compounds sensitise more strongly as they oxidise with age and air exposure. Natural origin does not change the allergen chemistry.
What is the difference between fragrance free and unscented?
Fragrance free means no fragrance material was added. Unscented means the product has no perceptible scent, which can be achieved with masking fragrance. For someone avoiding allergens, fragrance free is the term that matters.
Can I tell the allergen amount from its position in the list?
Only roughly. Ingredients over 1 percent appear in descending order, below that they can be listed in any order. A named allergen tells you it passed the declaration threshold, not its exact percentage, so treat presence as the signal.