Calcium gluconate is the calcium salt of gluconic acid, identified by CAS number 299-28-5. It appears as a white crystalline powder or granule and is freely soluble in water, which makes it versatile across food, pharmaceutical, and supplement applications. The FDA classifies it as a Generally Recognized as Safe (GRAS) substance under 21 CFR 184.1199.
Each 10 mL of injectable calcium gluconate solution provides 93 mg of elemental calcium, equivalent to 1 gram of the compound. In food applications, however, it is used in powder, granule, or liquid concentrate forms depending on the target product.
Food Additive Functions and Applications
The FDA lists calcium gluconate with multiple approved technical effects in food: firming agent, flavor enhancer, formulation aid, nutrient supplement, sequestrant, stabilizer, thickener, and texturizer. This range of functions makes it one of the most versatile calcium-based food additives available.
In baked goods and cereals, calcium gluconate granules provide both calcium fortification and textural benefits. Liquid forms are convenient for beverages, juices, and dairy products where easy mixing is essential. Its neutral taste profile allows incorporation without altering the flavor of finished products.
Calcium Fortification in Beverages and Dairy
Food manufacturers choose calcium gluconate to fortify drinks and dairy products because of its high water solubility. Unlike less soluble calcium salts, it dissolves completely in liquid systems and delivers bioavailable calcium that the body can readily absorb.
Calcium-fortified orange juice, plant-based milks, and functional beverages frequently contain this ingredient. The solubility increases with temperature, which gives manufacturers flexibility during hot-fill processing operations.
Pharmaceutical and Medical Uses
In medicine, calcium gluconate is administered intravenously to treat hypocalcemia, hyperkalemia, and magnesium poisoning. It is also used as an oral supplement for preventing calcium deficiency, osteoporosis, and rickets. The injectable form requires careful pH adjustment between 6.0 and 8.2 for safety.
Research published in Biomolecules and Therapeutics has explored its effects on inflammatory conditions, including rheumatoid arthritis models, where water-soluble calcium salts showed potential for modulating immune responses.
Dietary Supplements and Tablets
Calcium gluconate is formulated into tablets and capsules for the dietary supplement market. These solid forms provide a convenient daily calcium intake method and are commonly found in multivitamin formulations. The compound’s mild taste and good tolerability make it suitable for chewable supplement formats as well.
Manufacturers select the specific form based on their product type, target consumer, and manufacturing process. Powder works well for dry blends, liquid concentrate suits beverages, and tablets serve the retail supplement channel.
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