In this article
- What synthetic fragrance is and what it does in a product
- Where you will find synthetic fragrance
- Why people avoid synthetic fragrance
- What regulators and the evidence say
- The debate
- How to spot synthetic fragrance on a label
- What to use instead
- Fragrance in the laundry and the home
- Frequently asked questions
“Fragrance” (or “parfum”) is the most opaque word in cosmetics. It represents a mixture that can contain dozens to hundreds of individual aroma chemicals, protected as a trade secret, so none of them needs to be named. People avoid synthetic fragrance mainly for two reasons: fragrance compounds are among the most common causes of cosmetic contact allergy, and the lack of disclosure makes it impossible to avoid specific components — including phthalates — any other way.
What synthetic fragrance is and what it does in a product
Modern fragrance is chemistry, not crushed flowers. Perfumers build scents from a palette of thousands of natural and synthetic aroma molecules, chosen for character, stability and price. A finished fragrance concentrate is then dosed into everything from fine perfume to laundry liquid. In skincare it may serve no purpose beyond pleasure and brand identity — which is precisely why dermatologists so often suggest it as the first thing a reactive skin should lose: it is the one ingredient category whose absence costs the product nothing functionally.
Two label terms need separating: fragrance-free means no fragrance material was added; unscented can mean a masking fragrance was added to neutralise the base smell. They are not the same claim.
Where you will find synthetic fragrance
- Almost every scented product: lotions, shampoos, conditioners, body washes, deodorants
- "Gentle" and baby products more often than parents expect — check, don't assume
- Products whose ingredient list ends in "parfum" even when marketed as natural-leaning
- Household products, scented candles and laundry products, which add to total exposure
Why people avoid synthetic fragrance
Allergy is the headline reason. Fragrance mixtures consistently rank among the most frequent causes of allergic contact dermatitis in patch-test clinics, and fragrance sensitivity can develop after years of uneventful use. For people with eczema, rosacea or generally reactive skin, removing fragrance is the single highest-yield change most dermatologists suggest.
The second reason is disclosure. Because the mixture is secret, a consumer cannot avoid a specific component they react to, cannot check whether the fragrance contains phthalates, and cannot compare one product's fragrance system with another's. A third group avoids synthetic fragrance on environmental or preference grounds — preferring essential-oil scenting or no scent at all — while noting honestly that natural aroma chemicals (linalool, limonene) are themselves recognised allergens that oxidise in air. "Natural" fragrance is a different profile, not an allergen-free one.
What regulators and the evidence say
The EU operates the world's most developed fragrance-allergen regime: a set of specified fragrance allergens must be named individually on the label when present above tiny thresholds (0.001% in leave-on products, 0.01% in rinse-off), and the list was expanded in 2023 to cover more than 80 substances, with transition periods for industry to comply. The US, by contrast, still allows the blanket term "fragrance", though the 2022 Modernization of Cosmetics Regulation Act directed the FDA to develop fragrance-allergen labelling rules.
Medical literature is consistent that fragrance is a leading contact allergen in cosmetic users; estimates of fragrance allergy in the general population are commonly put in the low single digits percent, and far higher among people with existing eczema. That combination — common allergen, zero disclosure — is the entire case, and it is a solid one.
The debate
The regulators’ position
Regulators treat fragrance allergy as a labelling problem to be managed. The EU names more than 80 fragrance allergens that must be declared on the label above tiny thresholds — 0.001% in leave-on products, 0.01% in rinse-off — and expanded the list in 2023. The US still permits the single blanket word ‘fragrance’, with the FDA’s allergen-labelling rule directed by the MoCRA law still in progress.
The critics’ position
Allergy specialists point out that fragrance is among the most common causes of cosmetic contact allergy in patch-test clinics, and that a trade-secret formula means neither consumers nor their doctors can identify which chemical to avoid. Defenders of fragrance answer, fairly, that natural aroma chemicals such as linalool and limonene allergen just as readily — ‘natural’ is not the dividing line in this debate.
How to spot synthetic fragrance on a label
- Fragrance, Parfum, Aroma, Perfume — the umbrella terms
- Named individual allergens (EU labels): linalool, limonene, geraniol, citronellol, eugenol, coumarin and similar — these may come from essential oils as well as synthetic mixes
- "Unscented" on the front with "parfum" on the back means masking fragrance is present
- Truly fragrance-free brands usually say so explicitly and list no parfum at all
What to use instead
The fragrance-free shelf is larger than it used to be: pharmacy brands built for eczema and sensitive skin (the Vanicream and CeraVe style of formulation) are fragrance-free by design, and our guide to moisturisers without fragrance walks through them. If you love scent, alternatives include products scented only with disclosed essential oils (patch-test; natural allergens apply) and keeping fragrance in rinse-off or clothing-level products rather than leave-on facial skincare — a compromise many sensitive-skin owners settle on happily.
Pair fragrance-free basics with the barrier ingredients in ingredients to look for — ceramides and niacinamide especially — and the "clinical" feel of fragrance-free products largely disappears.
Fragrance in the laundry and the home
A fragrance-elimination experiment often fails in an unexpected place: not the bathroom, but the laundry. Scented detergents and fabric conditioners deposit fragrance on fabric that sits against skin all day and against the face all night (pillowcases are the classic missed exposure for facial dermatitis). Home fragrance — candles, diffusers, sprays — adds an airborne layer that matters for the subset of people whose symptoms are respiratory as well as dermal. Dermatologists investigating stubborn cases routinely audit these sources after cosmetics. If you are running the experiment, run it whole-household for a month: fragrance-free laundry products are now a mainstream supermarket category, and the pillowcase test alone has solved more 'mystery' facial eczema than any serum.
Frequently asked questions
What is the difference between fragrance-free and unscented?
Fragrance-free means no fragrance material was added for scent. Unscented means the product has no noticeable scent, which may be achieved with a masking fragrance — the ingredient list will still show parfum. For allergy management, fragrance-free is the claim that matters.
Can synthetic fragrance cause allergies even after years of use?
Yes. Allergic contact dermatitis is a sensitisation: the immune system can become reactive after repeated exposure, so a product used happily for years can become a problem. This is one reason dermatologists ask about fragrance first when adult eczema appears.
Are essential oils a safe substitute?
They are a substitute, not a guarantee. Several essential-oil components (linalool, limonene, geraniol) are recognised allergens that the EU requires to be labelled, and oxidised oils are more sensitising than fresh ones. Many people tolerate them well; patch testing is the sensible route.
Why don't brands have to list fragrance ingredients?
Fragrance formulas are protected as trade secrets in most jurisdictions. The EU carved out an exception for specified allergens; the US is developing allergen labelling rules following its 2022 cosmetics law reforms.
Is fragrance in rinse-off products a problem too?
Less so for most people, because contact time is short — but for hand eczema and scalp problems, rinse-off fragrance is still a common culprit. People doing a strict elimination usually remove fragrance everywhere for a period, then reintroduce selectively.
Why do 'fragrance-free' products still have a smell?
Raw ingredients have their own odours — oils smell oily, fatty alcohols smell faintly waxy. Fragrance-free means nothing was added to scent or mask; a mild base smell is expected and is not evidence of hidden parfum. The INCI list is the arbiter: no 'parfum', no fragrance.
Checked against US FDA, EWG Skin Deep cosmetics database, European Commission, Cancer Research UK sources · Last updated 2026-10-22 · How we assess ingredients
