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Calcium, vitamin D, and your bones

Your body needs calcium to keep your bones dense and strong. Low bone density can cause your bones to become brittle and fragile. These weak bones can break easily, even without an obvious injury.

Vitamin D helps your body absorb calcium. Eat foods that provide the right amounts of calcium, vitamin D, and protein. This kind of diet will give your body the building blocks it needs to make and maintain strong bones.

How Much Calcium and Vitamin D do I Need?

Amounts of calcium are given in milligrams (mg), and vitamin D is given in international units (IU).

All children ages 9 to 18 should have:

  • 1300 mg of calcium daily
  • 600 IU of vitamin D daily

All adults under age 50 should have:

  • 1000 mg of calcium daily
  • 400 to 800 IU of vitamin D daily

Adults age 51 and older should have:

  • Women: 1200 mg of calcium daily
  • Men: 1000 mg of calcium daily

Men and women: 800 to 1000 IU of vitamin D daily

Too much calcium or vitamin D can lead to problems such as an increased risk for kidney stones.

  • Total calcium should not exceed 2000 mg per day
  • Total vitamin D should not exceed 4000 IU per day
Calcium source

Calcium and Dairy Products

Milk and dairy products are the best sources of calcium. They contain a form of calcium that your body can absorb easily. Choose yogurts, cheeses, and buttermilk.

Adults should choose fat-free (skim) milk or low-fat (2% or 1%) milk, and other lower fat dairy products. Removing some of the fat does not lower the amount of calcium in a dairy product.

  • Yogurt, most cheeses, and buttermilk come in fat-free or low-fat versions.
  • Vitamin D helps your body use calcium, which is why vitamin D is often added to milk.

If you eat very few or no dairy products, you can find calcium in other foods. It is often added to orange juice, soy milk, tofu, ready-to-eat cereals, and breads. Check the labels on these foods for added calcium.

Other Sources of Calcium

Green leafy vegetables, such as broccoli, collards, kale, mustard greens, turnip greens, and bok choy (Chinese cabbage), are good sources of calcium.

Other good food sources of calcium are:

  • Salmon and sardines that are canned with their bones (you can eat these soft bones)
  • Almonds, Brazil nuts, sunflower seeds, tahini (sesame paste), and dried beans
  • Blackstrap molasses

Other tips to make sure your body can use the calcium in your diet:

  • Cook high-calcium vegetables in a small amount of water for the shortest possible time. They will retain more calcium this way.
  • Be careful about what you eat with calcium-rich foods. Certain fibers, such as wheat brain and foods with oxalic acid (spinach and rhubarb), can prevent your body from absorbing calcium.

Your doctor may recommend a calcium or vitamin D supplement for the calcium and vitamin D you need. However, the balance between benefits and harms of these supplements is unclear.

Alternative Names

Osteoporosis - calcium; Osteoporosis - low bone density


Cosman F, de Beur SJ, LeBoff MS, et al. Clinician's Guide to Prevention and Treatment of Osteoporosis. Osteoporos Int. 2014;25(10):2359-2381. PMID: 25182228 www.ncbi.nlm.nih.gov/pubmed/25182228.

Moyer VA; U.S. Preventive Services Task Force. Vitamin D and calcium supplementation to prevent fractures in adults: U.S. Preventive Services Task Force recommendation statement. Ann Intern Med. 2013;158(9):691-696. PMID: 23440163 www.ncbi.nlm.nih.gov/pubmed/23440163.

National Institutes of Health, Office of Dietary Supplements. Dietary supplement fact sheet: Calcium. Updated June 01, 2016. ods.od.nih.gov/factsheets/Calcium-HealthProfessional. Accessed July 19, 2016.

National Osteoporosis Foundation. Vitamin D and bone health. Osteoporosis Clinical Updates 2012. my.nof.org/bone-source/eduction/clinical-updates/clinical-updates-vitamin-d-and-bone-health. Accessed July 19, 2016.

Review Date 5/14/2016

Updated by: Gordon A. Starkebaum, MD, Professor of Medicine, Division of Rheumatology, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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