Calcium Supplements Guide (2026): Who Needs Them and What to Buy
By Erin Rose Updated October 12, 2026 Sources
Adults need 1,000 mg of calcium a day, and 1,200 mg for women over 50 and everyone over 70, counting food and supplements together (NIH). Many people get much of that from food, so supplement only the gap, 500 mg or less at a time. Calcium pills do not clearly prevent fractures in healthy adults, and the heart evidence is mixed, so more is not better.
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What calcium does
- Builds and keeps bones. Almost all of your body’s calcium is in your bones and teeth. Your body also uses it for muscles, nerves and blood vessels (NIH).
- How much you need. 1,000 mg a day for adults 19 to 50 and men up to 70; 1,200 mg for women over 50 and everyone over 70 (NIH). How much calcium, by age and sex.
- Food first. U.S. women get about 842 mg a day from food and men about 1,083 mg (NIH). One cup of milk has about 300 mg and 8 ounces of plain yogurt about 415 mg.
- Vitamin D helps you absorb it. Your body needs vitamin D to absorb calcium (NIH), and many calcium pills include it.
Who is likely to need more calcium
- Women past menopause. Women lose about 1% of their bone density a year after menopause, and their need rises to 1,200 mg a day at 51 (NIH).
- People who eat little or no dairy. People with lactose intolerance or a milk allergy, and vegans, are more likely to fall short. Lactose-free dairy has the same calcium (NIH).
- Adults over 70. Everyone over 70 needs 1,200 mg a day (NIH).
About 39% of people 4 and older fall below the average requirement, even counting supplements (NIH, 2007 to 2010 survey). Estimate your own gap.
What calcium pills do and don’t do
- Fractures: not clearly. In the best-run trials, calcium supplements did not lower fractures in healthy adults over 50 (Bolland 2015). The U.S. task force advises against low-dose calcium with vitamin D to prevent fractures in healthy women past menopause; that does not cover people with osteoporosis (USPSTF 2018). Calcium with vitamin D cut hip fractures by about 16% in older adults, with the biggest gain in care homes (Avenell 2014).
- Heart: mixed evidence. Some studies found calcium supplements might raise the risk of heart disease; others found no link, and NIH says more research is needed. One 2010 review found more heart attacks in people taking calcium alone (Bolland 2010).
- Kidney stones: a small rise. In the largest trial, calcium with vitamin D raised kidney stones by 17% (Jackson 2006). Taking calcium with food lowers the risk, according to the Bone Health and Osteoporosis Foundation.
The upper limit is 2,500 mg a day for adults 19 to 50 and 2,000 mg after 50 (NIH). More on the heart, stones and fractures.
Which form
Calcium carbonate is the cheapest and has the most calcium per pill, but take it with a meal. Calcium citrate can be taken without food and appears to cause less gas and constipation (NIH). With food, studies disagree on whether citrate absorbs any better. Citrate vs carbonate.
Whatever the form, take 500 mg or less at a time: absorption from supplements is highest at that size (NIH). In our scan of 499 NIH calcium labels, 49% put more than 500 mg in one serving.
Which calcium to buy
Buy calcium that is on a public testing list. 4 of the 10 calcium supplements we score are on one. Our pick, Nature Made Calcium 600 mg with D3, is at the top of the page. By need:
- Buy Citracal Petites (calcium citrate + D3) on Amazon
- Buy Nature Made Calcium, Magnesium and Zinc with D3 (300 tablets) on Amazon
- Buy Thorne Calcium (120 capsules) on Amazon
See all 10 we score, with each score, cost per 500 mg and testing list.
Calcium guides
How much and when
Which form
Which product
How we checked this
Products. We read 12 calcium products and could score 10. Scores rebuilt October 12, 2026. Every score, and why some are not scored.
Testing lists. NSF/ANSI 173 and NSF Certified for Sport (our copies), USP Verified (our copy of September 22, 2026).
Prices. Each brand’s own list price for one pack, or Vitacost or Target where the brand’s store blocked our reads or shows no price. Amazon’s price can differ.
Label scan. 499 calcium labels from the NIH Dietary Supplement Label Database; how we read them.
Sources
- NIH Office of Dietary Supplements. Calcium fact sheet for health professionals (needs, food, intakes, at-risk groups, upper limit, forms, absorption, heart, kidney stones; updated June 22, 2026; read October 12, 2026).
- Bone Health and Osteoporosis Foundation. Calcium and vitamin D supplement safety fact sheet (read October 12, 2026).
- Bolland MJ, et al. Calcium intake and risk of fracture: systematic review. BMJ. 2015. PubMed 26420387
- US Preventive Services Task Force. JAMA. 2018. PubMed 29677309. Avenell A, et al. Cochrane Database Syst Rev. 2014. PubMed 24729336
- Jackson RD, et al. Calcium plus vitamin D supplementation and the risk of fractures. N Engl J Med. 2006. PubMed 16481635
This page is for information. It is not medical advice.