What is Ferrous Citrate?
Ferrous citrate (CAS Number: 23383-11-1) is a chemical compound consisting of iron in the ferrous (Fe2+) state complexed with citric acid. This combination creates a soluble iron salt that can be readily absorbed by the human body. The citrate component acts as a chelating agent, improving the bioavailability of iron compared to some other iron compounds used in food fortification.
Common Uses
Ferrous citrate is used primarily as a nutrient supplement in fortified food and beverage products. Common applications include breakfast cereals, grain products, nutritional beverages, and other processed foods designed to increase dietary iron intake. The compound is chosen for fortification applications because of its relative stability and bioavailability in food matrices. The citrate form helps prevent oxidation and maintains iron solubility across varying pH conditions in different food products.
Safety Assessment
Ferrous citrate has not been designated as Generally Recognized as Safe (GRAS) by the FDA under its current CAS number, though iron compounds as a category are well-established nutrients with extensive safety data. The FDA has recorded zero adverse events and zero recalls associated with ferrous citrate, indicating no documented safety incidents in the U.S. food supply.
Iron as a nutrient is essential for human health, functioning primarily in oxygen transport and energy metabolism. However, like all nutrients, iron has established tolerable upper intake levels. The National Academies of Sciences, Engineering, and Medicine sets the tolerable upper intake level for iron at 40-45 mg per day for adults to avoid gastrointestinal distress and iron accumulation concerns. Products containing ferrous citrate are formulated to remain well within these safety parameters for typical consumption patterns.
The citrate chelation of iron does not introduce additional safety concerns. Citric acid and citrate salts are commonly used food additives with established safety records. The combination maintains the safety profile of both iron and citrate as separate ingredients.
Regulatory Status
Ferrous citrate is not approved as a direct food additive under FDA regulations in the United States, though iron compounds generally appear on the FDA's list of affirmed GRAS substances for nutrient supplementation. Its specific regulatory status reflects the FDA's classification framework rather than safety concerns. In other regulatory jurisdictions, ferrous compounds are commonly permitted for food fortification.
Manufacturers using ferrous citrate as a nutrient supplement must comply with applicable labeling regulations, including accurate declaration on ingredient lists and nutrition facts panels. The compound must be used in accordance with good manufacturing practices and at levels that do not exceed established nutrient intake recommendations.
Key Studies
Iron bioavailability studies have demonstrated that ferrous compounds, particularly those in citrate form, are among the most bioavailable iron sources for food fortification. Research published in nutritional science literature confirms that citrate complexation improves iron absorption compared to ferric forms and some other iron salts. These findings support the selection of ferrous citrate as a fortification ingredient in products designed to address iron deficiency.
The long safety history of iron fortification in foods, combined with zero documented adverse events and recalls for ferrous citrate specifically, provides substantial reassurance regarding its safety when used as directed in food fortification applications.