Calcium: Essential Mineral for Health and Wellness

What Is Calcium?

Calcium is a chemical element with the symbol Ca and atomic number 20. It is a reactive alkaline earth metal that forms a dark oxide-nitride layer when exposed to air Source 2. It is also the most abundant mineral in the human body.

Why Calcium Matters

Over 99% of the body’s calcium is stored in bones and teeth, where it provides structural support Source 4. The mineral is essential for bone health, muscle function, and nerve signaling. Because the body cannot produce calcium on its own, it must be obtained through the diet Source 5.

Recommended Daily Intake

Most adults require at least 1,000 mg of calcium per day, though needs vary by age, sex, and life stage Source 1.

Best Dietary Sources of Calcium

Dairy Products

Milk, yogurt, and cheese are well-known, highly absorbable sources.

Non-Dairy Options

Excellent alternatives include leafy green vegetables, canned fish with edible bones (such as sardines and salmon), fortified plant-based milks and juices, nuts, seeds, and legumes Source 10.

Calcium Supplements: When and How to Use

Supplements may be considered when dietary intake is insufficient. Always consult a healthcare provider before starting, as a balanced diet remains the preferred source Source 3.

Potential Deficiency and Health Risks

Inadequate calcium can lead to weak bones, increased fracture risk, muscle cramps, and numbness. Long-term deficiency is linked to osteoporosis Source 7.

FAQ

How much calcium do I need each day?
Most adults require at least 1,000 mg daily, though needs vary by age and gender.

What are the best non-dairy sources of calcium?
Leafy greens, fortified plant milks, canned fish with bones, almonds, and tofu are excellent options.

Can I get too much calcium?
Excessive intake from supplements may cause digestive issues or kidney stones; always follow recommended dosages.

Do calcium supplements interact with medications?
Yes—calcium can affect absorption of certain antibiotics, thyroid medications, and bisphosphonates; consult your doctor.

How can I tell if I’m not getting enough calcium?
Symptoms may include brittle nails, muscle cramps, and frequent fractures; a blood test can confirm levels.

Is it better to get calcium from food or supplements?
Food sources are generally preferred because they provide additional nutrients and better absorption; supplements are a backup option.