Did you know only a set list of fragrance allergens must be named on a label?
UK and EU rules require certain fragrance allergens to be named individually, while the rest of a scent blend can hide behind one word. What that means for sensitive skin, and how the list is growing.
The fact, stated plainly
UK and EU cosmetics rules require a defined list of fragrance allergens to be named individually on the label when they are present above a set level, even when the rest of the scent blend is simply called “Parfum”. For years this list contained 26 allergens, including limonene, linalool, citronellol, geraniol and eugenol. The EU has now expanded that list to around 80, phasing in over a transition period, so you will gradually see more of them spelled out.
Why most of the fragrance stays hidden
A single fragrance can be a blend of dozens or even hundreds of individual ingredients. The full recipe is treated as commercial information, so it is allowed to sit under one umbrella word, “Parfum” or “Fragrance”, rather than being listed line by line. The named allergens are the exception carved out of that black box: regulators picked out the scent chemicals most often linked to skin reactions and said these, at least, must be declared so that sensitised people can see them. So the label is not hiding things at random. It is hiding the bulk of the recipe but revealing the handful of ingredients most likely to matter for allergy.
Who this affects most
This matters most to people who already know, or suspect, that a specific fragrance chemical sets off their skin, and to anyone with eczema-prone or reactive skin who is trying to avoid their triggers. If your trigger happens to be one of the named allergens, the label gives you a fighting chance of spotting it. If your trigger sits inside the unnamed part of “Parfum”, the label alone will not reveal it, which is one reason patch testing under a dermatologist is so useful.
How to spot it on a label
The named allergens tend to appear near the end of the ingredient list, often clustered around the word “Parfum”. A practical approach:
- Learn the specific named allergens that affect you, rather than trying to memorise the whole list.
- Scan the tail end of the ingredients, where these allergens and many preservatives sit.
- Treat the appearance of several named allergens as a sign the product is meaningfully fragrant, even if the front says “lightly scented”.
As more allergens are added under the expanded rules, labels will get more transparent, but the skill stays the same: reading for your own named triggers.
What to do
Build a short list of the named allergens that affect you and keep it with you when you shop. If you have not yet pinned down your trigger, favour “fragrance-free” products while you work it out, and consider asking your GP about patch testing. Introduce new scented products one at a time so a reaction can be traced to a single source, and remember that the named-allergen list is a tool for spotting your trigger, not a promise that unnamed ingredients are safe.
When to see a professional
A pharmacist can suggest fragrance-free options and soothing basics for mild, occasional irritation. See a GP if reactions are frequent, spreading or persistent, or if you cannot identify what is causing them. A GP can refer you to a dermatologist, who can carry out patch testing using standardised fragrance mixes to identify precisely which chemicals you react to. That is a far more reliable route than reading labels alone. This page is educational and is not medical advice.
A short video clip on this is coming soon.
Check it against your own list
A free tool like INCIDecoder explains the named allergens, but cannot tell you whether a product contains your particular ones. A personal-list app like ClearaScan lets you save your named-allergen triggers once and scan any product, cosmetic, food or medication, against your ingredient guard list, flagging only yours. It also keeps a Reaction Journal, a shared Care Circle, and a Trusted Products list, and it is currently in early access. (Disclosure: our editor co-founded ClearaScan, and we are not paid to mention the others.)
The Sensitive Skin Ingredient Decoder
A free one-page guide to reading a skincare label fast: the irritants to watch, the fragrance loopholes, and what "fragrance-free" and "hypoallergenic" really mean.
Common questions
What are the 26 fragrance allergens?
They are a defined list of scent chemicals, including limonene, linalool, citronellol, geraniol and eugenol, that UK and EU cosmetic rules have long required to be named individually on a label when present above a set level. They are the fragrance ingredients most often linked to skin reactions.
Why can the rest of the fragrance just say 'Parfum'?
A fragrance can be a blend of dozens or hundreds of ingredients, and the full recipe is treated as commercial information, so it is grouped under the single word Parfum or Fragrance. Only the specified allergens have to be broken out and named.
Is the list of named allergens changing?
Yes. The EU has expanded the list from 26 to around 80 fragrance allergens, phasing in over a transition period. Over time you will see more of these spelled out on labels, which is good news for anyone trying to spot their trigger.
How do I find my allergen near the bottom of the list?
Named allergens usually appear after the main ingredients, often just before or after the word Parfum. Learn the specific ones that affect you and scan the tail end of the list for those, rather than trying to read every line.
What if I react but cannot identify the ingredient?
See a GP, who can refer you to a dermatologist for patch testing. Patch testing uses standardised fragrance mixes to identify exactly which chemicals you react to, which is far more precise than guessing from labels.