# Cobalt Sulfate

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> Markdown URL: https://additivefacts.com/additives/cobalt-sulfate-prohibited-with-exceptions.md

**Safety rating:** AVOID
**CAS number:** 10124-43-3
**Category:** other
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

Cobalt sulfate is an inorganic compound used as a malting or fermenting aid and surface-active agent in food production. It is prohibited for use in most food applications in the United States with limited exceptions, and is not recognized as Generally Recognized as Safe (GRAS) by the FDA.

## Regulatory status

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

## Detailed analysis

## What is Cobalt Sulfate?

Cobalt sulfate (CAS Number: 10124-43-3) is an inorganic chemical compound consisting of cobalt and sulfate ions. It appears as a pink or red crystalline solid and is soluble in water. In industrial and food contexts, cobalt sulfate serves as a source of cobalt, a trace element that plays roles in various biochemical processes. The compound is distinct from cobalt as a nutritional micronutrient; cobalt sulfate is a specific chemical form used in manufacturing and processing contexts.

## Common Uses

Historically, cobalt sulfate has been explored for use as a malting aid in beer production, where it may influence yeast fermentation processes. It has also been investigated as a surface-active agent, which refers to substances that modify surface tension and improve mixing or emulsification properties in food systems. However, due to regulatory restrictions, its actual use in food production is extremely limited in most jurisdictions. When cobalt sulfate appears in food-related contexts today, it is primarily in research settings or in countries where specific exemptions may apply.

## Safety Assessment

Cobalt is an essential trace element required for vitamin B12 synthesis in the human body, but excess cobalt exposure presents health concerns. Cobalt and its compounds have been associated with various toxic effects at elevated exposure levels, including effects on the cardiovascular system, nervous system, and hematopoietic (blood-forming) system. Animal studies have demonstrated that cobalt exposure can cause myocardial effects and peripheral neuropathy.

The International Agency for Research on Cancer (IARC) has classified cobalt and cobalt compounds as "possibly carcinogenic to humans" (Group 2B) based primarily on evidence from occupational inhalation studies in workers, particularly those exposed to cobalt dust in hard metal manufacturing. However, the relevance of inhalation exposure data to oral food ingestion remains an important distinction.

According to FDA records, there have been zero adverse event reports and zero recalls associated with cobalt sulfate in food applications, suggesting either minimal current use or successful prevention of problematic exposures through regulatory restrictions.

## Regulatory Status

In the United States, cobalt sulfate is prohibited as a food additive with exceptions. It is not listed as a GRAS substance by the FDA. The prohibition reflects regulatory caution regarding potential health risks from ingested cobalt compounds. The "with exceptions" designation indicates that limited use may be permitted under specific, defined circumstances, though such exceptions are narrow in scope.

The European Food Safety Authority (EFSA) and most international food regulatory bodies maintain similar cautious positions toward cobalt compounds in food. The Codex Alimentarius Commission has not established a general approval for cobalt sulfate as a food additive.

## Key Studies

Research on cobalt toxicity has primarily emerged from occupational health literature, where workers in industries such as hard metal tool manufacturing experienced documented health effects from chronic exposure. These studies informed regulatory decisions about cobalt compounds in consumer products.

Nutrition research distinguishes between cobalt as an essential micronutrient (in forms like cyanocobalamin/B12) and cobalt salts like cobalt sulfate. The distinction is important because the bioavailability, metabolic fate, and toxicity profiles differ significantly between these forms.

Limited published data exists on cobalt sulfate specifically as a food additive, partly because regulatory restrictions have minimized its use in food systems. The precautionary approach taken by regulatory agencies reflects both the lack of clear safety data for food applications and the known toxicity potential of cobalt at elevated exposures.

## 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. "Cobalt Sulfate — Safety, regulation, and evidence." https://additivefacts.com/additives/cobalt-sulfate-prohibited-with-exceptions. Accessed 2026-05-19.