# Boric Acid

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**Safety rating:** AVOID
**CAS number:** 10043-35-3
**Category:** lubricant
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-02

## Summary

Boric acid (CAS 10043-35-3) is a naturally occurring compound that functions as a lubricant or release agent in food manufacturing. It is not approved as a food additive by the FDA and is not recognized as Generally Recognized As Safe (GRAS) for food use.

## Regulatory status

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

## Detailed analysis

## What is Boric Acid?

Boric acid is a weak inorganic acid with the chemical formula H₃BO₃. It occurs naturally in seawater, plants, and mineral deposits. The compound exists as white, odorless crystals or powder and has been used industrially for decades in various applications including glass manufacturing, cosmetics, and cleaning products.

## Common Uses

In industrial food manufacturing contexts, boric acid has been explored as a lubricant and release agent to prevent food products from sticking to processing equipment. Its lubricating properties make it theoretically useful in high-temperature food processing environments. However, due to regulatory restrictions, it is not currently permitted for direct food contact use in the United States or most other developed nations.

Historically, boric acid was used as a food preservative in some countries, but this practice has been discontinued in most regions due to regulatory action and health concerns.

## Safety Assessment

Boric acid and its salts are regulated as toxic substances when ingested in significant quantities. The substance is classified as a reproductive and developmental toxicant. Animal studies have demonstrated that chronic exposure to boric acid can affect fertility and fetal development at high dose levels.

According to FDA records, there have been zero reported adverse events and zero recalls associated with boric acid in food as of current data. However, this reflects its non-permitted status rather than an established safety profile for food use. The absence of adverse event reports is primarily due to regulatory prohibition preventing its intentional addition to foods.

The European Food Safety Authority (EFSA) has also maintained restrictions on boric acid use in food products, consistent with FDA policy.

## Regulatory Status

Boric acid is not approved by the FDA as a food additive and does not have GRAS (Generally Recognized As Safe) status for food applications. It is prohibited for intentional addition to human food in the United States under 21 CFR regulations.

The FDA classifies boric acid as a substance that may be present in food only at incidental levels and only from non-food sources. This means any presence in food must be unintentional and below established limits.

International regulatory bodies, including those in the European Union, Canada, and Australia, similarly prohibit or severely restrict boric acid use in food products.

## Key Studies

Toxicological research on boric acid has primarily focused on occupational exposure and environmental contamination rather than food use specifically. Studies have indicated that boron compounds, when consumed chronically at elevated levels, can impact reproductive health and development in animal models.

The lack of approved food use means minimal human consumption data exists for boric acid as an intentional food ingredient. Regulatory agencies have relied on toxicological data and the precautionary principle in maintaining the prohibition.

Any detection of boric acid in food products would typically trigger investigation and potential enforcement action by the FDA.

## 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. "Boric Acid — Safety, regulation, and evidence." https://additivefacts.com/additives/boric-acid. Accessed 2026-05-19.