# 2-ethyl-4-methylthiazole

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**Safety rating:** UNKNOWN
**CAS number:** 15679-12-6
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

2-ethyl-4-methylthiazole is a synthetic flavoring compound belonging to the thiazole chemical family. It is used in the food industry to impart savory, meaty, and roasted flavor notes to processed foods and beverages.

## 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 2-ethyl-4-methylthiazole?

2-ethyl-4-methylthiazole (CAS Number: 15679-12-6) is a heterocyclic organic compound containing a thiazole ring structure with ethyl and methyl substituents. Thiazoles are a class of aromatic compounds that naturally occur in foods as flavor components generated during cooking processes such as roasting, grilling, and fermentation. This particular thiazole is produced synthetically for use as a flavoring agent in the food industry.

## Common Uses

2-ethyl-4-methylthiazole is utilized as a flavoring agent or adjuvant in various food and beverage applications. It is primarily employed to create or enhance savory profiles in processed foods, including meat products, snack foods, soups, sauces, and seasonings. The compound contributes roasted, meaty, and umami-like sensory characteristics that appeal to consumer preferences for fuller, more complex flavors. It may also appear in certain seasoning blends and flavor formulations used by food manufacturers.

Because this compound mimics naturally occurring flavor components in cooked foods, it serves as a cost-effective alternative to natural flavoring extracts or traditional cooking methods in industrial food production.

## Safety Assessment

2-ethyl-4-methylthiazole has not received FDA GRAS (Generally Recognized as Safe) status. However, this designation reflects the specific regulatory pathway rather than an indication of hazard. The FDA has received zero adverse event reports associated with this additive and has issued no recalls involving this compound.

The safety profile of this thiazole appears favorable based on available evidence. Similar thiazole compounds have been evaluated in the flavor industry and generally demonstrate low toxicity in typical food-use concentrations. The compound's use levels in food are expected to be minimal, as it functions as a potent flavoring agent requiring only small quantities to achieve desired sensory effects.

As with most synthetic flavoring compounds, safety assessment focuses on:
- Acute toxicity at relevant exposure levels
- Chronic exposure effects from dietary consumption
- Metabolic fate and potential for bioaccumulation
- Allergenicity and sensitization potential

## Regulatory Status

2-ethyl-4-methylthiazole operates in a complex regulatory landscape that varies by jurisdiction. In the United States, while not GRAS-approved, it may be permitted for use as a flavoring agent under FDA regulations governing synthetic flavoring substances (21 CFR 182.60). The absence of GRAS status does not prohibit its use; instead, it indicates the manufacturer has not pursued formal GRAS notification or that such a notification has not been finalized.

The European Food Safety Authority (EFSA) has established procedures for evaluating flavoring compounds, though specific assessments for this particular thiazole would depend on industry submissions and available toxicological data. Different countries may have varying approval statuses for this flavoring compound.

Manufacturers utilizing 2-ethyl-4-methylthiazole in food products are responsible for ensuring compliance with local regulations and proper labeling as required by their respective jurisdictions.

## Key Studies

Limited published scientific literature specifically addresses 2-ethyl-4-methylthiazole in isolation. Most relevant data exists within proprietary manufacturer safety dossiers submitted to regulatory authorities. The flavor industry's Scientific Committee has evaluated similar thiazole compounds used in food flavoring, generally finding them acceptable at typical use levels.

Research on thiazole compounds broadly demonstrates that this class of compounds undergoes metabolic transformation in the body and does not accumulate in tissues. Use concentrations in flavored foods are typically measured in parts per million (ppm), well below levels that would raise toxicological concerns based on available evidence from similar compounds.

Additional toxicological and sensory studies may exist in manufacturer confidential submissions to regulatory bodies, but are not always published in peer-reviewed literature.

## 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. "2-ethyl-4-methylthiazole — Safety, regulation, and evidence." https://additivefacts.com/additives/2-ethyl-4-methylthiazole. Accessed 2026-05-19.