# Potassium Oleate

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**Safety rating:** SAFE
**CAS number:** 143-18-0
**Category:** emulsifier
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

Potassium oleate is a potassium salt of oleic acid, a naturally occurring fatty acid. It functions as an emulsifier, stabilizer, and antimicrobial agent in food formulations, helping to blend ingredients that don't naturally mix and extend shelf life.

## Regulatory status

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

## Detailed analysis

## What is Potassium Oleate?

Potassium oleate (CAS Number 143-18-0) is an organic salt derived from oleic acid, a monounsaturated fatty acid commonly found in vegetable oils, animal fats, and nuts. The compound is produced through the neutralization of oleic acid with potassium hydroxide. Structurally, it consists of a long hydrocarbon chain with a carboxyl group bonded to potassium, creating an amphiphilic molecule with both water-loving and fat-loving properties. This dual nature makes it particularly useful in food manufacturing.

## Common Uses

Potassium oleate is primarily used in the food industry as an emulsifier and stabilizer. Its ability to reduce surface tension between immiscible substances allows it to help maintain uniform mixtures of oil and water-based ingredients, which would otherwise separate. The compound is also employed as a formulation aid in various processed foods and beverages. Beyond food applications, potassium oleate is used in cosmetics, pharmaceuticals, and industrial applications including metalworking fluids and textile processing.

In food manufacturing, potassium oleate helps achieve desired texture, consistency, and shelf stability in products where ingredient separation would compromise quality or consumer acceptability.

## Safety Assessment

Potassium oleate is derived from oleic acid, which is a fatty acid recognized as safe in food products worldwide. The FDA's Adverse Events database contains zero reported adverse events associated with potassium oleate, and the FDA's recall database similarly shows no recalls linked to this additive.

Oleic acid itself is present naturally in many common foods consumed regularly without safety concerns. When oleic acid is converted to potassium oleate, the resulting compound maintains a safety profile consistent with its parent substance. Potassium, as a component, is an essential mineral required for human physiological function, though excessive intake from all dietary sources should be monitored in individuals with specific medical conditions such as kidney disease.

The antimicrobial properties attributed to potassium oleate are consistent with known properties of fatty acid salts, which can inhibit microbial growth through disruption of cell membranes, though this function is typically secondary to its primary role as an emulsifier in food applications.

## Regulatory Status

Potassium oleate has not received GRAS (Generally Recognized As Safe) status from the FDA, which means it has not undergone formal FDA affirmation. However, this distinction does not imply the substance is unsafe; rather, it indicates that formal FDA review and approval documentation has not been completed or published. The absence of GRAS status is not uncommon for many food additives, and regulatory approval varies by country.

In the European Union, potassium oleate is listed as an approved food additive (E572) for use as an emulsifier in specific food categories, particularly in chewing gum where it helps maintain proper texture and consistency. This EU approval represents a comprehensive safety assessment conducted by the European Food Safety Authority (EFSA).

Regulatory status varies globally; manufacturers must ensure compliance with regulations in their specific jurisdiction before using potassium oleate in food products.

## Key Studies

Limited published research specifically focuses on potassium oleate as an isolated compound in food applications. However, extensive scientific literature exists on oleic acid and its derivatives, demonstrating their general safety profile in food and pharmaceutical contexts. Studies on fatty acid salts more broadly show they function effectively as emulsifiers with well-understood mechanisms of action.

The safety profile of oleic acid has been extensively documented through decades of food consumption data. The conversion to potassium oleate does not substantially alter the safety characteristics, as the compound simply combines a recognized safe fatty acid with potassium.

## 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. "Potassium Oleate — Safety, regulation, and evidence." https://additivefacts.com/additives/potassium-oleate. Accessed 2026-05-20.