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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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Things worth knowing about "Calcium Phosphate"

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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