Calcium Phosphate – Function, Deficiency & Use
Calcium phosphate is a compound of calcium and phosphate that is essential for building bones and teeth and is used as a dietary supplement and food additive.
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Calcium phosphate is a compound of calcium and phosphate that is essential for building bones and teeth and is used as a dietary supplement and food additive.
What Is Calcium Phosphate?
Calcium phosphate refers to a group of inorganic compounds composed of the minerals calcium and phosphate. It is the most abundant mineral compound in the human body and forms the majority of the inorganic substance found in bones and teeth. Calcium phosphate occurs in several forms in nature, including monocalcium phosphate, dicalcium phosphate, and tricalcium phosphate. In the body, it is found primarily as hydroxyapatite, a crystalline structure that gives the skeleton its hardness and strength.
Biological Functions
Calcium phosphate plays several vital roles in the human body:
- Bone and tooth formation: Approximately 99% of the body's calcium and around 85% of its phosphate are stored as calcium phosphate in bones and teeth, providing structural rigidity.
- Mineral reservoir: Bone acts as a reservoir for calcium and phosphate, releasing them into the bloodstream as needed to maintain mineral homeostasis.
- Cellular functions: Phosphate is essential for energy metabolism (ATP production), DNA synthesis, and a wide range of biochemical processes.
- Signaling: Calcium is critical for muscle contraction, nerve impulse transmission, and blood clotting.
Dietary Sources
Calcium phosphate is naturally present in many foods. Rich sources include:
- Milk and dairy products (cheese, yogurt)
- Fish with edible bones (e.g., sardines)
- Legumes and nuts
- Whole grain products
- Green leafy vegetables (e.g., broccoli, kale)
As a food additive, calcium phosphate is approved under the E-numbers E341a (monocalcium phosphate), E341b (dicalcium phosphate), and E341c (tricalcium phosphate). It is used as a leavening agent, firming agent, anti-caking agent, and acidity regulator in processed foods.
Recommended Intake
Recommended daily calcium intake varies by age and life stage. According to the World Health Organization (WHO) and national health authorities, the general guidelines are:
- Adults (19–50 years): 1,000 mg calcium per day
- Adolescents (13–18 years): 1,200 mg calcium per day
- Older adults (51+ years): 1,000–1,200 mg calcium per day
- Pregnant and breastfeeding women: 1,000 mg calcium per day
For phosphate, the recommended daily intake for adults is approximately 700 mg per day.
Deficiency Symptoms
Insufficient intake of calcium or phosphate can lead to serious health consequences:
- Calcium deficiency (hypocalcemia): Muscle cramps, numbness, tingling sensations, and in severe cases heart arrhythmias and seizures.
- Rickets: In children, severe calcium and vitamin D deficiency can cause rickets, a condition in which bones become soft and malformed.
- Osteoporosis: Long-term calcium deficiency increases the risk of osteoporosis, characterized by reduced bone density and increased fracture risk.
- Phosphate deficiency (hypophosphatemia): Muscle weakness, bone pain, and in severe cases breathing difficulties.
Use as a Dietary Supplement
Calcium phosphate supplements are used medically for:
- Prevention and treatment of osteoporosis
- Support during periods of increased calcium demand (e.g., pregnancy, breastfeeding, growth phases)
- Treatment of hypocalcemia (low blood calcium levels)
- Promotion of dental health
The bioavailability of calcium phosphate is generally good but can be influenced by vitamin D status, magnesium levels, and overall dietary habits. Vitamin D significantly enhances the intestinal absorption of calcium.
Overdose and Risks
Excessive intake of calcium phosphate, particularly through supplements, may cause unwanted effects:
- Constipation and gastrointestinal discomfort
- Kidney stones (with very high calcium intake)
- Hypercalcemia (elevated blood calcium): nausea, vomiting, weakness, and in severe cases cardiac complications
- Persistently high phosphate intake may impair kidney function and disturb the calcium-phosphate balance
The tolerable upper intake level (UL) for calcium according to the EFSA is 2,500 mg per day for adults.
Interactions
Calcium phosphate can interact with various medications and nutrients:
- Vitamin D: Promotes intestinal calcium absorption and is essential for calcium metabolism.
- Iron and zinc: High calcium intake may reduce the absorption of these minerals.
- Bisphosphonates and tetracycline antibiotics: Calcium can reduce the absorption of these medications; a time interval of at least 2 hours is recommended.
- Magnesium: A balanced ratio of calcium to magnesium is important for bone health and muscle function.
References
- World Health Organization (WHO): Calcium and Magnesium in Drinking Water. WHO Press, Geneva, 2009.
- Weaver CM, Peacock M: Calcium. Advances in Nutrition, 2011; 2(3): 290-292. doi:10.3945/an.111.000463
- European Food Safety Authority (EFSA): Scientific Opinion on Dietary Reference Values for Calcium. EFSA Journal, 2015; 13(5):4101.
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Related search terms: Calcium Phosphate + Calcium-Phosphate + Tricalcium Phosphate