At a glance
| Chemical family | A monoterpene alcohol; the rose note. A main constituent of rose, palmarosa and citronella oils, and the unsaturated relative of citronellol |
| CAS number | 106-24-1 |
| Classification | Not IARC-classified (absence of evaluation, not a safety finding). A constituent of Fragrance Mix I (7.7% panel positivity), though not its dominant allergen; an EU-declared fragrance allergen |
| Where you encounter it | Detergents, soaps, personal-care products and insect repellents; naturally in rose, palmarosa, geranium and citronella oils |
| Sleep micro-environment relevance | Fragrance that survives laundering and sits against the skin all night; as a terpene it also oxidizes over time into stronger sensitizers |
| Activated carbon capture | Not the main lever — the exposure that matters is skin contact with treated fabric, so fragrance-free laundry is the direct fix |
What it is
Geraniol is a monoterpene alcohol and the compound that smells of roses. It is a main constituent of rose, palmarosa and citronella oils and is used widely as a fragrance in detergents, soaps and personal-care products, and as an insect repellent. Peer-reviewed — Buckley et al. 2006
Geraniol is not IARC-classified; it does not appear in the IARC list of classified agents. Inferred — geraniol does not appear in the IARC list of classified agents; that is an absence of evaluation, not a finding of safety So this is not a cancer page. It is an allergy page: geraniol is one of the eight compounds in Fragrance Mix I, the original panel dermatologists use to screen for fragrance allergy.
How it relates to the bedroom
The fragrance that survives the wash
Geraniol's bedroom route is ordinary fragrance. It is used in detergents, soaps and personal-care products, and laundry scent is engineered to persist on fabric, so it remains on washed bedding pressed against skin. Inferred — from geraniol's documented use as a soap and detergent fragrance and the designed persistence of laundry scent; geraniol specifically has not been measured on laundered bedding For most sleepers this is unremarkable. For someone sensitized to geraniol, it is a nightly, warm, occluded dose to the face and neck.
A Fragrance Mix I constituent
Geraniol is one of the eight constituents of Fragrance Mix I, the original standard screening mix for fragrance allergy. In a series of 23,660 patients patch-tested to the European standard series, 7.7% reacted to Fragrance Mix I. Peer-reviewed — Buckley et al. 2006
Geraniol is a recognised member of that panel rather than its heaviest hitter — within FM I, compounds like cinnamal and isoeugenol carry more weight. Saying so is more useful than implying every panel member is equally likely to be your problem. Inferred — geraniol's rank within FM I is not quantified in the source cited here; the claim is limited to its membership of the panel and the panel's overall positivity
A terpene, so it gets worse with age
Geraniol is a terpene, and terpenes autoxidize on contact with air. The pattern is best documented for linalool, where the fresh molecule showed no sensitizing potential but its air-exposed hydroperoxides were clearly positive sensitizers. Peer-reviewed — Sköld et al. 2004 The same chemistry applies to geraniol as an unsaturated terpene, so an aged, air-exposed product is a more potent sensitizer than a fresh one. Inferred — the autoxidation-to-hydroperoxide mechanism is directly demonstrated for linalool and limonene; extending it to geraniol follows from the shared terpene chemistry
Geraniol is an EU-declared fragrance allergen and must be named on cosmetic labels above threshold (0.001% leave-on, 0.01% rinse-off), with compliance from 31 July 2026. Regulatory — EU 2023/1545
What the research says
- Not IARC-classified. Geraniol does not appear in the IARC list; an absence of evaluation, not a safety finding. Inferred
- A Fragrance Mix I constituent. 7.7% of 23,660 patch-tested patients reacted to Fragrance Mix I. Peer-reviewed — Buckley et al. 2006
- Not the dominant allergen in its own panel. Within FM I, cinnamal and isoeugenol carry more weight. Inferred
- A terpene, so it oxidizes. Air exposure converts terpenes into stronger sensitizers; aged product is more allergenic. Inferred — from the demonstrated linalool/limonene autoxidation mechanism
- EU-declared allergen. Must be named on cosmetic labels above threshold. Regulatory — EU 2023/1545
What helps reduce it
Use fragrance-free detergent on bedding. This is where geraniol actually reaches you, through fragrance engineered to persist on fabric. Inferred
If you are fragrance-allergic, ask for the Fragrance Mix I breakdown. Geraniol sits in that panel, so a positive mix warrants testing its constituents individually. Peer-reviewed — Buckley et al. 2006
Prefer fresh products over long-aged scented ones. Terpene oxidation raises allergenic potency with air exposure over time. Inferred
What does NOT help
- Treating it as a cancer risk. Geraniol is not IARC-classified; the documented hazard is contact allergy. Inferred
- Assuming "natural rose oil" is safer. Rose and palmarosa oils are the richest natural sources of geraniol; natural origin does not reduce sensitization. Inferred
Open research questions
- How much geraniol actually persists on laundered bedding from detergent fragrance — not measured. Speculation
- Whether geraniol-specific autoxidation products have been characterized as thoroughly as those of linalool and limonene. Speculation
Citations
- Buckley DA, Basketter DA, Smith Pease CK, Rycroft RJG, White IR, McFadden JP (2006). Simultaneous sensitivity to fragrances. British Journal of Dermatology 154(5):885–888. Of 23,660 patients patch-tested to the European standard series, 1,811 (7.7%) reacted to Fragrance Mix I; geraniol is one of the eight constituents of that mix. PMID 16634891. doi.org/10.1111/j.1365-2133.2006.07170.x Peer-reviewed
- Sköld M, Börje A, Harambasic E, Karlberg A-T (2004). Contact allergens formed on air exposure of linalool. Chemical Research in Toxicology 17(12):1697–1705. Cited here for the terpene autoxidation mechanism: the fresh molecule showed no sensitizing potential, while its air-exposed hydroperoxides were clearly positive sensitizers. PMID 15606147. doi.org/10.1021/tx049831z Peer-reviewed
- Commission Regulation (EU) 2023/1545 amending Regulation (EC) No 1223/2009 as regards labelling of fragrance allergens (Annex III). Geraniol must be declared on cosmetic labels above 0.001% (leave-on) / 0.01% (rinse-off); compliance from 31 July 2026. EUR-Lex Regulatory
Frequently asked questions
What is geraniol?
Geraniol is a monoterpene alcohol and the compound that smells of roses. It is a main constituent of rose, palmarosa and citronella oils and is widely used as a fragrance in detergents, soaps and personal-care products, and as an insect repellent. In the bedroom it reaches you as fragrance that persists on laundered bedding.
Is geraniol a carcinogen?
Geraniol does not appear in the IARC list of classified agents, so it has no IARC carcinogenicity classification. That is an absence of evaluation rather than a finding of safety. Its documented hazard is skin sensitization.
How allergenic is it?
Geraniol is one of the eight constituents of Fragrance Mix I, the original standard screening mix for fragrance allergy. In a series of 23,660 patients patch-tested to the European standard series, 7.7% reacted to Fragrance Mix I. Geraniol is a recognised member of that panel, though it is not its dominant allergen — cinnamal and isoeugenol carry more weight.
Should I be worried about it?
For most people, no. Geraniol is not IARC-classified and rose scent is not a cancer risk. It matters if you have fragrance contact allergy, where geraniol is one of the Fragrance Mix I panel compounds. The chemistry caveat is that it is a terpene, so like limonene and linalool it oxidizes in air into stronger sensitizers as a product ages. Fragrance-free bedding laundry is the direct fix.
Related compounds
Embr is a sleep environment company researching and addressing the chemistry of the bedroom. Research and product development in progress.
Last reviewed 2026-07-14. If you find a factual error, contact us.