Calcium
Also known as: Calcium Citrate, Calcium Carbonate, Calcium Malate, Calcium Glycinate
Calcium is the most abundant mineral in the body and is essential for building and maintaining strong bones and teeth. It plays critical roles in muscle contraction, nerve transmission, and hormone secretion. Calcium is vital for cardiovascular function and blood clotting.
Benefits
Essential for bone health and reducing osteoporosis risk. Critical for muscle contraction and nervous system function. Supports cardiovascular health and healthy blood pressure. Important for tooth enamel strength and dental health. Supports hormonal balance and may reduce PMS symptoms. Important for enzyme function and cellular signaling.
Recommended Dosage
RDA: 1,000–1,200 mg/day for adults (19–50 years 1,000 mg; 51+ years 1,200 mg for women, 1,000 for men). Common supplement doses: 500–1,000 mg daily (split doses for better absorption). Upper limit: 2,000 mg/day from all sources. Take with food for citrate forms, without food for carbonate. Absorption improved with vitamin D.
Food Sources
Dairy products (milk, yogurt, cheese), leafy greens (collard greens, turnip greens, bok choy), fortified plant milks, sardines with bones, salmon with bones, almonds, sesame seeds, tofu, kale, broccoli.
Side Effects
Generally well-tolerated at recommended doses. High intakes may cause: constipation, gas, bloating, kidney stone formation (in susceptible individuals). May cause hypercalcemia at excessive doses: nausea, weakness, kidney damage, bone pain. Milk-alkali syndrome possible with very high intake.
Interactions
Reduces absorption of antibiotics (tetracyclines, fluoroquinolones) — separate by 2–4 hours. Interferes with absorption of iron, zinc, magnesium — separate by 2 hours. Thiazide diuretics reduce calcium excretion. May reduce effectiveness of some blood pressure medications.
Warnings
Those with kidney disease should monitor intake. History of kidney stones requires medical supervision before supplementing. May worsen constipation or block absorption of other minerals if taken in excess. Avoid calcium carbonate in those with achlorhydria.
Deficiency Symptoms
Weak and brittle bones (osteoporosis risk). Muscle cramps and spasms. Tooth decay and weak enamel. Numbness and tingling in fingers. Heart palpitations and arrhythmias (severe deficiency). Delayed healing.
Frequently Asked Questions
What are the benefits of Calcium?▼
Essential for bone health and reducing osteoporosis risk. Critical for muscle contraction and nervous system function. Supports cardiovascular health and healthy blood pressure. Important for tooth enamel strength and dental health. Supports hormonal balance and may reduce PMS symptoms. Important for enzyme function and cellular signaling.
What is the recommended dosage for Calcium?▼
RDA: 1,000–1,200 mg/day for adults (19–50 years 1,000 mg; 51+ years 1,200 mg for women, 1,000 for men). Common supplement doses: 500–1,000 mg daily (split doses for better absorption). Upper limit: 2,000 mg/day from all sources. Take with food for citrate forms, without food for carbonate. Absorption improved with vitamin D.
What foods contain Calcium?▼
Dairy products (milk, yogurt, cheese), leafy greens (collard greens, turnip greens, bok choy), fortified plant milks, sardines with bones, salmon with bones, almonds, sesame seeds, tofu, kale, broccoli.
What are the side effects of Calcium?▼
Generally well-tolerated at recommended doses. High intakes may cause: constipation, gas, bloating, kidney stone formation (in susceptible individuals). May cause hypercalcemia at excessive doses: nausea, weakness, kidney damage, bone pain. Milk-alkali syndrome possible with very high intake.
What are the symptoms of Calcium deficiency?▼
Weak and brittle bones (osteoporosis risk). Muscle cramps and spasms. Tooth decay and weak enamel. Numbness and tingling in fingers. Heart palpitations and arrhythmias (severe deficiency). Delayed healing.
Related Supplements
Vitamin D
Vitamins
Vitamin D is a fat-soluble vitamin that plays a crucial role in calcium absorption, bone health, immune function, and mood regulation. Unlike most vitamins, your body can produce vitamin D when your skin is exposed to sunlight, earning it the nickname 'the sunshine vitamin.'
Vitamin C
Vitamins
Vitamin C is a water-soluble vitamin and powerful antioxidant that the human body cannot produce on its own. It is essential for the growth, development, and repair of all body tissues and plays a role in many body functions including immune defense, collagen formation, and iron absorption.
Omega-3 Fish Oil
Fatty Acids
Omega-3 fatty acids are essential polyunsaturated fats that your body cannot make on its own. The two most important omega-3s found in fish oil are EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). They play critical roles in brain function, heart health, and reducing inflammation throughout the body.
Supplement Disclaimer
This supplement information is for educational purposes only and should not replace professional medical advice. Dietary supplements are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a healthcare provider before starting any supplement, especially if you are pregnant, nursing, taking medications, or have a medical condition.