Flavor ingredient regulatory record
o-Propylphenol
o-Propylphenol is a phenol in the woody family, FEMA GRAS under FEMA number 3522 (CAS 644-35-9). Its odor is phenolic, medicinal, woody, sweet.
- FEMA
- 3522
- CAS
- 644-35-9
- JECFA
- 695
- EU FL
- 04.046
- Formula
- C9H12O
- EC
- 211-415-3
GRAS status: FEMA GRAS, publication 10. Recorded by FDA in the Substances Added to Food inventory under CAS 644-35-9.
Structure
Identity
Also known as: Phenol, 2-propyl-, Phenol, o-propyl-, 2-Propylphenol, 2-n-Propylphenol, o-n-Propylphenol, NSC 65646, 2-propylphenol, 2-n-propylphenol, phenol, 2-propyl-, phenol, o-propyl-, 1-hydroxy-2-n-propylbenzene, 1-(2-hydroxyphenyl)propane.
Can o-Propylphenol be labeled natural?
Since o-Propylphenol is found in nature, US labeling follows how it was obtained: natural flavor from a natural source and a natural process, artificial when o-Propylphenol is synthesized. In the EU and UK the natural claim likewise needs the natural route, while Mercosur and Mexico keep a third class, identical-to-natural, for the synthetic material.
- United States
- Natural or artificial, by process
- European Union and UK
- Natural only from natural material
- Mercosur and Mexico
- Natural or identical-to-natural
How each market defines the classes: natural vs artificial flavor under 21 CFR 101.22.
Regulatory status, with citations
United States
o-Propylphenol is FEMA GRAS under FEMA number 3522. It is cited in the Code of Federal Regulations at 21 CFR 172.515.
European Union and United Kingdom
Listed on the Union List of flavouring substances as FL 04.046, Annex I Part A under Regulation (EC) 1334/2008, evaluation status approved (EFSA). The UK retains the same list.
JECFA (WHO / FAO)
JECFA number 695, evaluated at the 64th meeting in 2005. no safety concern at current levels of intake.
Other US flags
Not on the California Proposition 65 list.
TSCA Inventory status
A flavor ingredient is also an industrial chemical. o-Propylphenol appears on the EPA Toxic Substances Control Act Chemical Substance Inventory under CAS 644-35-9, where EPA names it Phenol, 2-propyl-.
Active in US commerce
EPA designates this substance active, so no Notice of Activity Form B is required before manufacturing. What active and inactive mean.
EPA publishes no regulatory flags on this listing. What the flags mean.
From the EPA non-confidential TSCA Inventory, July 2026 release. EPA also maintains a confidential portion it does not publish. Search the Inventory by CAS number.
Odor and taste
Odor: Phenolic, medicinal, woody, sweet.
Taste: Bitter, astringent, slightly sweet.
Where it is used
o-Propylphenol is used in beverage, flavoring agent, cosmetics and pharmaceuticals, typically as a woody note.
Structurally similar flavor ingredients
Flavor ingredients with a GRAS determination closest to o-Propylphenol by structure. Whether one can replace it is a sensory and regulatory call; the reformulation tool works that through.
| Material | FEMA | Similarity | Occurrence |
|---|---|---|---|
| 1-Phenyl-1-propanol | 2884 | 95% | In nature |
| Phenethylamine | 3220 | 83% | In nature |
| Phenethyl alcohol | 2858 | 81% | In nature |
| S-Methyl benzothioate | 3857 | 79% | In nature |
| Propiophenone | 3469 | 75% | In nature |
More phenols in this index
Diphenyl ether · 2,3,6-Trimethylphenol · 3,4-Xylenol · Diphenyl · 2,6-Xylenol · Magnolol
o-Propylphenol FAQ
Is o-Propylphenol FEMA GRAS?
Yes. The FEMA Expert Panel lists o-Propylphenol as GRAS under FEMA number 3522. It is also codified at 21 CFR 172.515.
What are the FEMA and CAS numbers for o-Propylphenol?
o-Propylphenol is FEMA 3522, CAS 644-35-9. FEMA files it in the woody flavor category.
Does o-Propylphenol count as natural in the US and the EU?
o-Propylphenol occurs in nature, so the label depends on the route: o-Propylphenol won from a natural source by a physical, enzymatic or microbiological process is natural flavor in the United States, and synthesized o-Propylphenol is artificial. The EU and UK follow the same logic without a middle class; Mercosur and Mexico label synthetic o-Propylphenol identical-to-natural.
Is o-Propylphenol on the EU Union List?
o-Propylphenol is on the EU Union List of flavouring substances as FL 04.046 (Annex I Part A) under Regulation 1334/2008.
Has JECFA evaluated o-Propylphenol?
Yes. JECFA number 695, evaluated at the 64th meeting in 2005. Conclusion: no safety concern at current levels of intake.
How is o-Propylphenol described, and where does it show up?
Flavorists describe o-Propylphenol as phenolic, medicinal, woody, sweet. On the palate it is bitter, astringent, slightly sweet. It is used in beverage, flavoring agent, cosmetics and pharmaceuticals.
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Sources and attribution. The identity and regulatory facts on this page are taken from the FDA Substances Added to Food inventory, a US government record, which lists this substance as O-PROPYLPHENOL under CAS 644-35-9 and carries its FEMA number, its JECFA flavor number. The inventory is searchable at FDA. FDA records its technical effect as flavoring agent or adjuvant.
A FEMA GRAS conclusion is reached by the Expert Panel of the Flavor and Extract Manufacturers Association of the United States, and the FEMA number names that conclusion. FEMA publishes its own entry for this substance in the FEMA Flavor Library, which is the authoritative record of what the Panel decided and is worth reading alongside this page.
Ambrose Compliance is not affiliated with, endorsed by, or sponsored by FEMA. FEMA and FEMA GRAS are used here as identifiers for a published regulatory determination, not as marks of any relationship between FEMA and Ambrose.
About this page. Facts come from the FDA Substances Added to Food inventory, the Code of Federal Regulations, the EPA TSCA Inventory, the EU Union List, JECFA and the Ambrose database, with FEMA's published determination cited where it applies; parts of the text are written by Ambrose AI, which can make mistakes. Check the cited source before relying on anything here. This is not regulatory or legal advice.