Calcium Carbonate is an inorganic calcium salt that supports bone strength and helps neutralize gastric acid in pharmaceutical and dietary supplement formulations. In addition, Calcium Carbonate is widely used as a diluent and buffering agent in solid dosage forms.
Calcium Carbonate (CaCO₃) is an inorganic calcium salt composed of calcium ions (Ca²⁺) and carbonate ions (CO₃²⁻), commonly found in nature as limestone, marble, and chalk. It is one of the highest natural sources of calcium and is widely used across industries today.
Calcium Carbonate is widely used in pharmaceuticals and dietary supplements due to its high calcium content and natural alkalinity, helping support bone mineralization and neutralize excess gastric acid. These dual mechanisms make it a strategic ingredient in products targeting bone health and digestive wellness.
In pharmaceutical formulations, Calcium Carbonate is also commonly used as a diluent, binder, a buffering agent, and an opacifying agent in film-coating systems.
2. Active composition of Calcium Carbonate
Main component: Calcium Carbonate (CaCO₃)
Functional roles:
Provides a high elemental calcium content (~40%)
Neutralizes stomach acid (antacid effect)
Supports mineral balance in the body
Diluent in solid dosage form
Buffering agent
Opacifier for film coated
3. Key Advantages of Calcium Carbonate
An effective alternative to titanium dioxide (TiO₂), featuring exceptional natural whiteness, a uniform crystal structure, and an optimized refractive index. These properties enable calcium carbonate to provide excellent opacity and hiding power in film coating applications.
High elemental calcium content(~40%) enables efficient calcium supplementation with lower doses, optimizing cost and formulation space
pH buffering capacityallows rapid neutralization of stomach acid, ideal for digestive support products
High chemical stability extends shelf life and minimizes interactions with other ingredients
Good compressibility and flowabilitycompatible with various formulation processes.
Dual functionality (calcium supplementation + antacid)reduces the number of raw materials in formulations
4. Applications of Calcium Carbonate
API in Pharmaceuticals and Nutraceuticals:
Bone health products: Widely used as the primary calcium source to maintain bone density and structural strength. Its high elemental calcium content makes it suitable for long-term supplementation.
Digestive and antacid products: Acts as a key ingredient in digestive aids and antacid formulations. It reacts with stomach HCl to reduce acidity, alleviating symptoms such as heartburn, acid reflux, and stomach discomfort.
Multi-functional products:Often used as a dual-purpose ingredient to provide calcium supplementation and acid neutralization, optimizing formulation efficiency and market value.
Excipient:
Diluent in solid dosage form such as tablet, hard capsule, sachet and granule
Supports binder excipient functionality
Buffering agent, dissolution aid in dispersible tablets
An opacifying agent for pharmaceutical film coatings, serving as an excellent alternative to titanium dioxide (TiO₂).
Bulking agent in tablet sugar-coating process
5. Commercial products using Calcium Carbonate
6. Product contact information
For more information on sourcing Calcium Carbonate, please contact us:
Sample/COA Request: Please contact us via email to request a sample and the latest Certificate of Analysis (COA) for the raw material from the manufacturer Nitika Pharmaceutical Specialities Pvt. Ltd.
Succinic acid – High-quality ingredient, widely used as an optimal pH adjuster, excipient, and additive. Contact Biorich now!
Biorich Group
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Biorich Group provides raw materials and supply chain solutions for the pharmaceutical, nutrition, healthcare, cosmetics, food, and industrial sectors, with a global network of partners.
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