# Ammonium Sulfate (E517)

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**Safety rating:** SAFE
**E-number:** E517
**CAS number:** 7783-20-2
**Category:** flavoring
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

Ammonium sulfate (CAS 7783-20-2) is an inorganic salt used in food processing to strengthen dough, enhance flavors, and aid fermentation. It serves multiple functions in baking and grain processing, including acting as a leavening agent and flour treatment chemical.

## 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 Ammonium Sulfate?

Ammonium sulfate is an inorganic chemical compound with the molecular formula (NH₄)₂SO₄. It is a crystalline salt that occurs naturally in some mineral deposits and is commonly manufactured through industrial processes. In food production, it appears as a white or colorless solid with no significant odor. The compound dissociates into ammonium and sulfate ions when dissolved in water, which is central to its functional properties in food systems.

## Common Uses

Ammonium sulfate serves multiple roles in food manufacturing, primarily in baking and grain processing. As a dough strengthener and flour treating agent, it helps develop gluten networks, improving dough elasticity and gas retention in bread products. This results in better volume and texture in finished baked goods.

The compound also functions as a leavening aid, working with other leavening agents to produce carbon dioxide during fermentation or baking. In malting and fermentation processes, ammonium sulfate provides a nitrogen source for yeast and bacteria, supporting fermentation efficiency and product consistency.

Additionally, ammonium sulfate acts as a firming agent in certain food products and contributes mild flavor enhancement properties. Its multiple functional roles make it a versatile processing ingredient in the grain and baking industries.

## Safety Assessment

Ammonium sulfate has been used in food processing for many decades with an established safety record. The FDA has recorded zero adverse events and zero recalls associated with this additive, indicating no documented public health incidents from its use in approved applications.

Toxicological studies on ammonium sulfate show low acute toxicity. The primary route of concern would be ingestion, and studies indicate the compound has minimal bioaccumulation potential. Ammonium ions are metabolized by the body's normal biochemical pathways, and sulfate ions are readily excreted. The compound does not appear to cause significant organ toxicity at food-relevant exposure levels.

Exposure from food sources is typically minimal, as ammonium sulfate is used in processing rather than as a final product component in most cases. When present in finished foods, quantities are limited by functional necessity and processing standards.

## Regulatory Status

Ammonium sulfate is not listed as GRAS (Generally Recognized as Safe) by the FDA, meaning it does not have formal GRAS status for all food uses. However, this designation reflects the regulatory framework rather than a safety concern—many long-established food processing chemicals lack formal GRAS status simply due to when regulations were established.

The compound is approved for specific food processing uses in multiple countries, including within the European Union under Regulation (EC) 1333/2008 where it is categorized as a food additive. Different jurisdictions may have specific applications and maximum use levels where it is permitted.

Manufacturers must comply with applicable regulations in their production regions and ensure ammonium sulfate use does not exceed limits set for specific food categories where applicable.

## Key Studies

The safety profile of ammonium sulfate has been assessed through multiple toxicological studies spanning several decades. Research on ammonium compounds in food systems shows that metabolism occurs through normal biochemical pathways without unusual accumulation or toxic effects at food-relevant doses.

Functional studies demonstrate the compound's effectiveness as a dough strengthener and flour treatment agent, supporting its continued use in grain processing. The lack of FDA adverse events or recalls, combined with its long history of use, provides substantial real-world safety data.

Regulatory agencies continue to monitor all approved food additives, and the absence of safety signals for ammonium sulfate in post-market surveillance indicates no emerging safety concerns have been identified.

## Brands using Ammonium Sulfate

- Lewis Bakeries Inc. (2 products)
- Nature's Own (2 products)
- Ahold USA, Inc. (1 product)
- Alpha Baking Co., Inc. (1 product)
- Bob Evans (1 product)
- Conagra Brands, Inc (1 product)
- Flowers Foods, Inc. (1 product)
- Hannaford Bros. Co. (1 product)
- Hostess Brands, LLC (1 product)
- King's Hawaiian Bakery West (1 product)
- LIDL (1 product)
- Market Basket Inc. (1 product)
- Safeway, Inc. (1 product)
- Schwebel Baking Company (1 product)
- The Kroger Co. (1 product)
- The Schwan Food Company (1 product)
- Winco Foods, Inc. (1 product)

## 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. "Ammonium Sulfate (E517) — Safety, regulation, and evidence." https://additivefacts.com/additives/ammonium-sulfate. Accessed 2026-05-19.