# 5-methyl-2-phenyl-2-hexenal

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> Markdown URL: https://additivefacts.com/additives/5-methyl-2-phenyl-2-hexenal.md

**Safety rating:** UNKNOWN
**CAS number:** 21834-92-4
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

5-methyl-2-phenyl-2-hexenal is a synthetic flavoring compound used to impart fruity and floral notes in food and beverage products. It is not approved as GRAS (Generally Recognized as Safe) by the FDA but has generated no reported adverse events or recalls.

## Regulatory status

| Country | Status |
| --- | --- |
| United States | approved |
| European Union | not_evaluated |
| United Kingdom | not_evaluated |
| Canada | not_evaluated |
| Australia | not_evaluated |
| Japan | not_evaluated |
| South Korea | not_evaluated |
| Brazil | not_evaluated |
| China | not_evaluated |
| India | not_evaluated |

## Detailed analysis

## What is 5-methyl-2-phenyl-2-hexenal?

5-methyl-2-phenyl-2-hexenal (CAS Number: 21834-92-4) is a synthetic organic compound belonging to the aldehyde class of flavor chemicals. Its molecular structure consists of a hexenal backbone with a methyl group at the 5-position and a phenyl group at the 2-position. This structural configuration gives the compound distinctive aromatic properties that make it useful in flavor formulations.

## Common Uses

This flavoring agent is employed in the food industry primarily to create fruity, woody, and slightly floral flavor profiles. It is typically used in very small concentrations in applications such as beverages, confectionery, baked goods, and dairy products. Like most synthetic flavoring compounds, it functions as an adjuvant—meaning it works in combination with other flavor components to achieve desired taste and aroma characteristics. The compound is particularly valued for its ability to provide depth and complexity to fruit-based flavor systems.

## Safety Assessment

According to FDA records, 5-methyl-2-phenyl-2-hexenal has generated zero reported adverse events and zero recalls. This lack of negative safety data suggests the compound has not been associated with consumer health incidents. However, the absence of adverse events does not constitute formal safety approval. 

The compound does not hold GRAS (Generally Recognized as Safe) status from the FDA. GRAS designation requires either substantial scientific consensus or documented history of safe use in food. The lack of GRAS status indicates that this compound may not have undergone the same level of toxicological review as additives with formal FDA approval, or that manufacturers have not pursued GRAS notification for this particular ingredient.

The limited publicly available toxicological data on this specific compound means that comprehensive safety information from large-scale studies is not readily accessible. However, as a member of the aldehyde flavoring family, it shares chemical class characteristics with compounds that have been more extensively studied.

## Regulatory Status

In the United States, 5-methyl-2-phenyl-2-hexenal is not listed in the FDA's GRAS database, which means it does not have blanket approval for food use. However, this does not necessarily mean the ingredient is prohibited. Some flavoring compounds may be used under specific regulatory provisions or may be considered acceptable under food additive petition procedures.

The regulatory status of this compound in other regions, such as the European Union, may differ. The EFSA (European Food Safety Authority) maintains separate evaluations and approval lists for flavoring agents used in European markets.

Manufacturers intending to use this flavoring agent in food products should verify current regulatory requirements in their specific jurisdictions and ensure compliance with local food additive regulations.

## Key Studies

Publicly available peer-reviewed studies specifically focused on 5-methyl-2-phenyl-2-hexenal appear limited. Most information regarding this compound exists within industry flavor chemistry literature and technical safety data sheets maintained by manufacturers and flavor suppliers.

The broader aldehyde flavoring compound class has been the subject of safety research, with many members evaluated through the Flavor and Extract Manufacturers' Association (FEMA) Expert Panel process. However, specific toxicological studies on this individual compound are not widely published in open scientific literature.

The lack of published safety data does not necessarily indicate a safety problem but rather reflects that detailed toxicological evaluations for individual flavor compounds are often proprietary and maintained by the flavor industry rather than published in peer-reviewed journals.

## Sources

- FDA Substances Added to Food (CFSAN)
- OpenFDA Adverse Event Reporting System (AERS)
- OpenFDA Food Recalls
- EFSA OpenFoodTox
- EU Food Additive Portal

## Citation

Additive Facts. "5-methyl-2-phenyl-2-hexenal — Safety, regulation, and evidence." https://additivefacts.com/additives/5-methyl-2-phenyl-2-hexenal. Accessed 2026-05-19.