What is Calcium Glycerophosphate?
Calcium glycerophosphate (CAS Number: 27214-00-2) is an organic salt formed from the combination of calcium and glycerophosphoric acid. This compound exists as a white to off-white powder and is soluble in water, making it suitable for various food formulations. The molecular structure combines the mineral calcium with a phosphate-containing organic compound, creating a bioavailable form of calcium supplementation.
Common Uses
Calcium glycerophosphate is primarily used in the food industry as a calcium fortification ingredient, particularly in beverages, dairy products, and nutritional supplements. Its secondary function as a stabilizer and thickening agent makes it useful in formulations requiring texture modification and shelf-life extension. The compound is commonly found in functional foods and beverages marketed for bone health and calcium supplementation. Unlike some inorganic calcium salts, the glycerophosphate form may offer enhanced absorption characteristics, though this varies depending on individual digestive factors and food matrix composition.
Safety Assessment
Calcium glycerophosphate has generated zero adverse event reports in the FDA database and has no associated recalls. The compound has been used in food applications without documented safety incidents in regulatory systems. Since calcium is an essential mineral and glycerophosphoric acid is metabolized similarly to other phosphate compounds in the body, the combination presents a low inherent toxicity profile. However, the FDA has not granted this ingredient GRAS (Generally Recognized As Safe) status, meaning it has not undergone the formal GRAS notification process for use in the United States.
The lack of GRAS status does not indicate safety concerns but rather reflects the ingredient's limited use history in the American market or absence of formal petition submissions. In the European Union, similar calcium compounds are permitted as food additives under various regulatory frameworks, though calcium glycerophosphate's specific approval status varies by jurisdiction.
As with any calcium supplement, excessive dietary intake from fortified foods could theoretically contribute to hypercalcemia in susceptible populations, though this is rare from food sources alone. Individuals with certain medical conditions, kidney disease, or those taking specific medications should consult healthcare providers regarding additional calcium supplementation from any source.
Regulatory Status
In the United States, calcium glycerophosphate operates in a regulatory gray area. Without FDA GRAS status, it technically requires pre-market approval as a food additive, though enforcement varies. Some manufacturers may use it under the premise of established use or petition it for GRAS status. The compound is approved for use in some international markets, including certain European countries and other regions where it appears in authorized food additive lists.
The compound falls under FDA regulations for food additives and nutrient supplements depending on the product category. Manufacturers using this ingredient should maintain appropriate documentation of its safety and efficacy to support its use.
Key Studies
Limited peer-reviewed literature specifically addresses calcium glycerophosphate bioavailability compared to other calcium forms. Available research on glycerophosphate compounds generally demonstrates their metabolic safety and compatibility with food systems. Studies on calcium bioavailability from various organic calcium salts suggest that glycerophosphate forms can provide bioavailable calcium, though individual studies directly comparing this compound to other sources are sparse.
The phosphate component is readily metabolized through normal metabolic pathways, with no evidence of accumulation or toxicity at typical dietary exposure levels. The calcium component undergoes standard homeostatic regulation by the body, independent of its source compound.