# Manganese Hypophosphite

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**Safety rating:** SAFE
**CAS number:** 10043-84-2
**Category:** nutrient
**FDA GRAS:** no
**Adverse events (FDA AERS):** 0
**FDA recalls:** 0
**Last updated:** 2026-04-04

## Summary

Manganese hypophosphite is an inorganic compound used as a nutritional supplement to provide bioavailable manganese in fortified foods and beverages. It serves as a source of the essential trace mineral manganese, which plays important roles in bone development, metabolism, and antioxidant defense.

## 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 Manganese Hypophosphite?

Manganese hypophosphite is an inorganic salt compound composed of manganese and hypophosphite ions (H₂PO₂⁻). With CAS number 10043-84-2, this compound exists as a white to off-white crystalline powder. It is classified as a nutrient supplement rather than a food additive with a technological function, as its primary purpose is to provide elemental manganese for nutritional fortification.

## Common Uses

Manganese hypophosphite is used in the food and beverage industry as a manganese source for nutrient fortification. It may be added to breakfast cereals, nutritional supplements, fortified plant-based beverages, and other foods intended to increase manganese content. The compound is chosen for applications where solubility and bioavailability of manganese are desired.

Manganese is an essential trace element required for multiple physiological functions, including bone mineralization, carbohydrate metabolism, amino acid metabolism, cholesterol synthesis, and as a cofactor for the antioxidant enzyme manganese superoxide dismutase (MnSOD). The adequate intake (AI) for manganese ranges from 1.2-2.3 mg daily depending on age and sex according to the National Institutes of Health.

## Safety Assessment

Manganese hypophosphite has not been formally affirmed as Generally Recognized as Safe (GRAS) by the FDA, though this does not indicate safety concerns. Rather, it reflects that few manufacturers have submitted GRAS determinations for this specific compound to the FDA. The FDA maintains zero reported adverse events associated with manganese hypophosphite and zero product recalls, indicating a clean safety record in the regulatory database.

Safety considerations for manganese supplementation focus on total intake rather than specific formulation concerns. The FDA has established an upper tolerable intake level (UL) of 11 mg daily for adult manganese consumption. Excessive manganese intake, particularly from supplemental sources, has been associated with neurological effects in occupational exposure contexts, though dietary sources rarely approach concerning levels. The safety profile of manganese hypophosphite itself as a chemical compound appears benign at typical fortification levels, where it contributes only a fraction of total dietary manganese intake.

## Regulatory Status

Manganese hypophosphite is not listed on the FDA's GRAS list, meaning it has not undergone the formal FDA GRAS notification process. However, its absence from the GRAS list does not prohibit its use. Manufacturers may market foods containing this ingredient under the Food and Drug Administration Modernization Act (FDAMA), provided the ingredient meets the definition of a food additive under 21 CFR Part 170 and is used in accordance with applicable regulations.

In the European Union, manganese compounds including hypophosphites may be approved as nutritional additives under Regulation (EC) No. 1925/2006 concerning the addition of vitamins and minerals to foods, though specific approvals vary by jurisdiction.

## Key Studies

Scientific literature on manganese hypophosphite specifically is limited. Most relevant research addresses manganese biochemistry, bioavailability of different manganese compounds, and dietary manganese requirements. Studies in the Journal of Nutrition and American Journal of Clinical Nutrition have established the essential nature of manganese and characterized its metabolic roles. Research on various manganese salt formulations indicates differences in bioavailability, with hypophosphite compounds showing reasonable absorption characteristics.

The absence of adverse event reports and recalls in FDA databases, combined with the established safety profile of manganese as a nutritional element, suggests manganese hypophosphite presents minimal safety concerns when used at appropriate fortification levels consistent with maintaining total dietary manganese intake below the established UL.

## 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. "Manganese Hypophosphite — Safety, regulation, and evidence." https://additivefacts.com/additives/manganese-hypophosphite. Accessed 2026-05-20.