CONSTITUENT REPORT
Menthofuran
Menthofuran is an oxygenated mint constituent most often discussed as a secondary peppermint marker and as a safety-relevant metabolite in the pulegone literature. In the AromaForge archive it is clearly tied to peppermint chemotypes, where it appears at lower levels than menthol or menthone but still helps define profile character. Public evidence is strongest for identity, occurrence, mint biosynthesis, and toxicology centered on its relationship to pulegone, while direct human-use or benefit literature specific to isolated menthofuran is sparse.
Chemical identity and composition
NIST lists menthofuran under CAS 494-90-6 and synonyms including 4,5,6,7-tetrahydro-3,6-dimethylbenzofuran. In mint biochemistry it is a branch product linked to pulegone metabolism and is often treated as both a biosynthetic marker and a toxicological concern because of its reactive-metabolite pathway.
Aroma and practical use
- Use the recorded minty, green, herbal, slightly sweet, herbaceous descriptors to explore a blend's scent character; perceived strength also depends on the other ingredients.
- Read the route, preparation and experimental context before using a study finding to choose an oil.
Reported benefits and effects
Findings retain their study context. An animal or laboratory result describes that experiment.
pulegone to menthofuran proximate toxin
A foundational metabolism paper identified menthofuran as a proximate toxic metabolite formed from pulegone by hepatic microsomal monooxygenases.
Measured: conversion of pulegone to a proximate toxin
This experimental finding does not establish benefit, dose or safety in people using this blend.
reactive metabolite formation
A toxicology paper reported that menthofuran was a proximate hepatotoxic metabolite and investigated reactive-metabolite formation from its oxidation pathway.
Measured: reactive metabolite formation from menthofuran
This experimental finding does not establish benefit, dose or safety in people using this blend.
peppermint biosynthesis control
A plant biochemistry study demonstrated that menthofuran synthase is a cytochrome P450 monooxygenase responsible for menthofuran formation in mint, supporting menthofuran's role as a true peppermint biosynthetic branchpoint rather than just a degradation artifact.
Measured: identification of menthofuran synthase as a peppermint biosynthetic enzyme
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
Use concerns and concentration limits
Sensitization concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Phototoxicity concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Oxidation concernNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
Penetration enhancementNot flagged
Not flagged in the current model. This is not proof of absence or unrestricted safety.
A recorded constituent reference, not a recommended oil dilution. Product category, source applicability and all contributing oils must be checked before use.
recorded reference · Tisserand & Young, Essential Oil Safety 2e — menthofuran-specific dermal restriction basis (menthofuran capped at 0.5% of formulation, derived from Mentha piperita oil constituent limit)WHO/JECFA and related Inchem records state that menthofuran presents no safety concern at current levels of intake when used as a flavoring agent, but that conclusion applies to estimated flavor exposure rather than concentrated therapeutic use.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
EU Scientific Committee on Food review material treats pulegone and menthofuran together because menthofuran is a major pulegone metabolite and contributes to the same qualitative toxicity concern.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
Archive peppermint records already reflect the practical downstream implication of this literature by flagging menthofuran as part of the basis for peppermint-oil dermal restriction discussions.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
No direct public citation is attached to this entry.
Constituents it may interact with
These are research candidates recorded in the interaction matrix. They do not add a proven-amplification bonus to the score.
PulegoneAmplification candidate
Candidate in the research matrix. A coefficient alone does not establish amplification at the dose, route or goal of your blend; no proven amplification is inferred from this row.
animal · effect
No source citation attached.
Read Pulegone report →How the effects were investigated
reactive metabolite pathway from pulegone
Regulatory and toxicology sources describe menthofuran as a major metabolite of pulegone that can be further oxidized toward reactive intermediates, including pathways involving menthofuran epoxide and 8-pulegone aldehyde.
The source assessment applies to its specified exposure and preparation; this entry is not an unrestricted-use clearance.
menthofuran synthase control of peppermint oil composition
Peppermint biosynthesis work identified menthofuran synthase as a cytochrome P450 enzyme that converts pulegone-pathway intermediates and influences oil composition and accumulation patterns in glandular trichomes.
This reference does not establish a therapeutic result or a safe use level for a custom oil blend.
What this report cannot establish
- A reported constituent percentage does not establish an effective human therapeutic dose or the amount absorbed into the body.
- The presence of a constituent does not guarantee a clinical benefit, rash treatment or sleep improvement from a custom blend.
- An unflagged concern or missing use limit does not establish safety for ingestion, inhalation, skin exposure or a particular person.
- A candidate constituent interaction does not establish that two oils amplify one another at the selected proportions.
- Constituent descriptors alone do not establish a precise top, heart or base lifetime in a finished blend.
Known data gaps (4)
- The accessible literature for menthofuran is dominated by toxicology and biosynthesis, not by direct human-use research.
- This pass did not verify human clinical studies focused on isolated menthofuran, and that absence should remain visible in any downstream consumer-facing use of the record.
- Some findings do not record an explicit exposure route; consult the linked study before applying them to a use.
- Interaction candidates lack an attached source citation and remain unqualified.