# 3-mercaptohexyl Hexanoate

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**Safety rating:** UNKNOWN
**CAS number:** 136954-22-8
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

3-mercaptohexyl hexanoate is a synthetic flavoring compound used to impart fruity and sulfur-based aromatic notes in food products. It belongs to the thioesters class of flavor molecules and is employed in very small quantities in 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 3-mercaptohexyl Hexanoate?

3-mercaptohexyl hexanoate (CAS Number: 136954-22-8) is a synthetic organic compound classified as a thioester flavoring agent. It consists of a hexanoate (6-carbon fatty acid) ester combined with a 3-mercaptohexyl (6-carbon alcohol with a thiol functional group) backbone. The thiol group (-SH) is responsible for its characteristic sulfurous and fruity aromatic properties. This compound is manufactured through chemical synthesis and does not occur naturally in significant quantities in foods.

## Common Uses

As a flavoring agent, 3-mercaptohexyl hexanoate is used in trace amounts in the food industry to enhance or create specific flavor profiles. Its primary applications include:

- Savory and umami-type flavor systems
- Meat and poultry flavoring compounds
- Processed cheese and dairy flavoring applications
- Seasoning blends and condiments
- Beverages requiring complex sulfur-based notes

Typical usage levels are measured in parts per million (ppm), reflecting the potent nature of thioester flavor compounds. Food manufacturers use this additive as part of complex flavor formulations where it contributes to overall sensory appeal rather than serving as a primary flavor ingredient.

## Safety Assessment

3-mercaptohexyl hexanoate has not received FDA GRAS (Generally Recognized As Safe) status, meaning it has not been formally affirmed through the GRAS notification process. However, this classification does not indicate the additive is unsafe—rather, it reflects that formal safety review and confirmation have not been completed or submitted to the FDA.

According to FDA records, there are zero reported adverse events associated with this compound and zero recalls involving products containing it. The absence of safety alerts or adverse event reports suggests that if the compound is used in foods marketed in the United States, it has not generated consumer health complaints that reached FDA attention.

The compound's structural similarity to other approved thioester flavoring agents suggests potential safety, as the thioester functional group is well-characterized in flavor chemistry. However, without definitive GRAS status or published toxicological studies specific to this compound, complete safety data remain limited in the public domain.

## Regulatory Status

In the United States, 3-mercaptohexyl hexanoate operates under a less transparent regulatory pathway. Without GRAS affirmation, it may be used under the FDA's flavor ingredient regulations (21 CFR Part 182) if manufacturers and suppliers maintain appropriate safety documentation and follow required notification procedures. The FDA allows certain flavoring substances to be marketed without formal GRAS letters if they meet safety standards established through the Flavor and Extract Manufacturers' Association (FEMA).

International regulatory status varies. Some regulatory bodies in the European Union and other regions may have different requirements or approvals for this specific flavoring compound. Food manufacturers exporting to multiple markets must verify compliance with each jurisdiction's specific additive regulations.

The lack of GRAS status means this additive may have more limited use or require additional safety documentation compared to formally affirmed flavor ingredients. Manufacturers utilizing this compound should maintain detailed safety records and be prepared to provide documentation if requested by regulatory authorities.

## Key Studies

Publicly available peer-reviewed literature specifically examining 3-mercaptohexyl hexanoate is limited. Most safety information for thioesters comes from broader flavor chemistry research and structural similarity assessments rather than compound-specific toxicology studies.

The FEMA Expert Panel and similar safety-evaluating bodies typically assess flavor compounds using structure-activity relationship (SAR) models, existing toxicology data on related compounds, and production/use data. These assessments inform whether flavoring substances meet the threshold of safety for their intended uses.

Researchers and regulatory scientists in flavor toxicology continue to develop understanding of thioester metabolic pathways and potential concerns, though 3-mercaptohexyl hexanoate specifically has not been the focus of published independent research that is readily accessible. This represents a data gap rather than evidence of harm.

## 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. "3-mercaptohexyl Hexanoate — Safety, regulation, and evidence." https://additivefacts.com/additives/3-mercaptohexyl-hexanoate. Accessed 2026-05-19.