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    Calcium supplements


    Who should take calcium supplements?

    Calcium is an important mineral for the human body. It helps build and protect your teeth and bones.Getting enough calcium over your lifetime can help prevent osteoporosis.

    Most people get enough calcium in their normal diet. Calcium is found in dairy foods and leafy green vegetables. Older women and men may need extra calcium to prevent their bones from getting thin (osteoporosis).

    Your health care provider will tell you if you need to take extra calcium.

    Types of calcium supplements

    The two main forms of calcium pills are:

    • Calcium carbonate: Over-the-counter antacid products, such as Tums and Rolaids contain calcium carbonate. These sources of calcium carbonate do not cost very much. Each pill or chew provides 200 - 400 mg of calcium.
    • Calcium citrate: This is a more expensive form of the mineral. It is absorbed well on an empty or full stomach. People with low levels of stomach acid (a condition that is more common in people over age 50) absorb calcium citrate better than calcium carbonate.
    • Another type, calcium phosphate is less common.

    When choosing a calcium supplement:

    • Look the word "purified" or the United States Pharmacopeia (USP) symbol on the label.
    • Watch out for supplements made from unrefined oyster shell, bone meal, or dolomite that don't have the USP symbol. They may have high levels of lead or other toxic metals.

    How to take extra calcium

    Increase the dose of your calcium supplement slowly. Start with 500 mg a day for a week, and then add more over time.

    Try to spread the extra calcium you take over the day. Do not take more than 500 mg at a time. Taking calcium throughout the day will:

    • Allow more calcium to be absorbed
    • cut down on side effects such as gas, bloating, and constipation

    The total amount of calcium adults need every day from food or calcium supplements:

    • 19 - 50 years: 1,000 mg/day
    • 51 - 70 years: Men - 1,000 mg/day; Women - 1,200 mg/day
    • 71 years and over: 1,200 mg/day

    The body needs vitamin D is needed to help absorb calcium. Try to choose calcium supplements that also contain vitamin D.

    Side effects and safety

    Do not take more than the recommended amount of calcium without your doctor's OK.

    Try the following steps if you have side effects from taking extra calcium:

    • Drink more fluids.
    • Eat high-fiber foods
    • Switch to another form of calcium if the diet changes don't help.

    Always tell your health care provider and pharmacist if you are taking extra calcium. Calcium supplements may change the way your body absorbs some medicines. These include certain types of antibiotics and iron pills. Taking extra calcium over a long period of time raises the risk of kidney stones in some people.


    Institute of Medicine. Food and Nutrition Board. Dietary Reference Intakes for Calcium, Phosphorous, Magnesium, Vitamin D, and Fluoride. National Academy Press, Washington, DC, 2010.

    NIH Osteoporosis and Related Bone Diseases National Resource Center. Calcium and vitamin D: Important at every age. Reviewed January 2012 (accessed February 3, 2013).

    Rosen C. Osteoporosis. In: Goldman L, Schafer AI, eds. Cecil Medicine. 24th ed. Philadelphia, Pa: Saunders Elsevier; 2011:chap 251.


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                  Review Date: 2/4/2013

                  Reviewed By: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine. Also reviewed by A.D.A.M. Health Solutions, Ebix, Inc., Editorial Team: David Zieve, MD, MHA, Bethanne Black, Stephanie Slon, and Nissi Wang.

                  The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.

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                  St. Luke's Hospital - 232 South Woods Mill Road - Chesterfield, MO 63017 Main Number: 314-434-1500 Emergency Dept: 314-205-6990 Patient Billing: 888-924-9200
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