# Leek Oil

> Source URL: https://additivefacts.com/additives/leek-oil
> Markdown URL: https://additivefacts.com/additives/leek-oil.md

**Safety rating:** SAFE
**CAS number:** 977089-43-2
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

Leek oil is a natural flavoring agent derived from leeks (Allium ampeloprasum), composed of volatile compounds that provide the characteristic pungent onion-like taste. It is used in food manufacturing to enhance savory flavors in processed foods, seasonings, and culinary products.

## 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 Leek Oil?

Leek oil is a volatile essential oil extracted from leeks, vegetables belonging to the Allium genus alongside onions and garlic. The oil contains sulfur-containing compounds, including diallyl sulfide and other organosulfur volatiles, which are responsible for leek's distinctive pungent aroma and flavor profile. The CAS number 977089-43-2 identifies this specific substance in chemical databases. As a natural flavoring agent, leek oil represents one of many plant-derived flavor compounds used to enhance taste characteristics in food products without adding whole leek solids.

## Common Uses

Leek oil functions primarily as a flavoring agent and adjuvant in food manufacturing. It is utilized in savory food applications including soups, broths, prepared meals, seasonings, spice blends, and processed meat products. The oil allows manufacturers to impart leek flavor intensity while maintaining product consistency and shelf stability. Because it is a concentrated form, only small quantities are required to achieve the desired flavor profile, making it an efficient ingredient in commercial food production. Leek oil may also appear in certain pharmaceutical or nutraceutical preparations where leek flavor is desired.

## Safety Assessment

Leek oil, derived from leeks which have been safely consumed in culinary applications for centuries, presents a favorable safety profile based on available data. The FDA has recorded zero adverse events associated with leek oil consumption, and no food recalls have been linked to this additive. These metrics suggest it has not triggered safety concerns in the U.S. food supply. Leeks themselves are widely recognized as safe food items with no known inherent toxicity at typical consumption levels.

As a plant-derived flavoring agent composed of naturally occurring volatile compounds, leek oil is generally recognized as having low systemic toxicity at the levels used in food flavoring applications. However, some individuals with allergies to alliums (the plant family including onions, garlic, and leeks) may experience allergic reactions, though such reactions are relatively uncommon. The concentrated nature of essential oils means they should not be ingested in large undiluted quantities, consistent with standard safety practices for all essential oils.

## Regulatory Status

Leek oil has not received FDA GRAS (Generally Recognized As Safe) status, meaning it has not undergone the formal GRAS notification process. This does not indicate the additive is unsafe; rather, it reflects that a formal GRAS determination has not been submitted to or approved by the FDA. The European Union's EFSA (European Food Safety Authority) maintains similar regulatory frameworks for food flavorings, with natural flavoring substances evaluated under EC Regulation 1334/2008. Leek oil may be permitted under certain conditions in various jurisdictions, but regulatory status varies by country and specific application. Manufacturers using this ingredient should verify compliance with local food additive regulations.

## Key Studies

Scientific literature on Allium species, including leeks, demonstrates the safety and nutritional properties of these vegetables. Research has documented the volatile compounds in leeks and their organosulfur chemistry. However, specific toxicological or clinical studies focused exclusively on leek oil as a food additive are limited in published peer-reviewed literature. The safety assessment for leek oil is primarily based on the long history of leek consumption as a culinary ingredient and the known safety profile of its constituent volatile compounds rather than specific additive studies. Further research on leek oil's specific applications in food manufacturing could provide additional safety data, though the absence of adverse events and recalls suggests no significant safety issues have emerged in current use.

## 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. "Leek Oil — Safety, regulation, and evidence." https://additivefacts.com/additives/leek-oil. Accessed 2026-05-19.