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Evidence-Based Supplement Research
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Calcium

What does the research say about Calcium?

3 health outcomes synthesised

Calcium has been researched for 3 health outcomes, with the strongest evidence concerning its effect on bone mineral density, particularly total hip bone mineral density in postmenopausal women (4 studies). The most commonly studied dose is 1000 mg/day or greater, primarily as calcium carbonate, though beneficial effects on bone density were often seen only when combined with other interventions like exercise or collagen.

Strongest evidence: The most researched area is bone mineral density, with 4 studies on increased total hip bone mineral density in postmenopausal women, but the evidence strength is low overall. Two of those studies reported beneficial small-to-moderate effects, but only when calcium was combined with other interventions (exercise or collagen), making it difficult to isolate calcium's role.

Mixed or weaker evidence: For reduced stillbirth in pregnant women (3 studies), the evidence is also low, with 2 studies reporting neutral effects and 1 finding a small benefit that did not reach statistical significance. Similarly, for improved bone mineral density in other populations (3 studies), 1 showed a small benefit in postmenopausal women with osteoporosis, while 2 found neutral effects in kidney transplant recipients and women with type 2 diabetes.

Effective dose patterns: The only specific effective dose reported is 1000 mg/day or greater (calcium carbonate in one study) for stillbirth reduction. No consistent effective dose emerged for bone density outcomes across studies.

Population insights: Postmenopausal women (including those with osteopenia) are the most studied population for bone density outcomes. For stillbirth, research focuses on pregnant women, including those with prior pre-eclampsia/eclampsia. The beneficial effect for bone mineral density was observed only in postmenopausal women with osteoporosis, suggesting the benefit may not generalize to other groups.

Notable caveats: Across all three syntheses, the evidence base is small (3-4 studies each) and generally low in strength. Many individual studies did not reach statistical significance, and beneficial effects were often seen only in combined interventions, not calcium alone. Certainty of evidence ranged from very low to moderate, and outcome measures (e.g., hip vs. femoral neck BMD) were not consistent across studies.

Frequently asked

  • What is Calcium good for according to research?
    Research suggests calcium may have a small benefit for bone mineral density in postmenopausal women, particularly when combined with exercise or collagen (2 of 4 studies showed beneficial effects). For stillbirth reduction in pregnant women, the evidence is weak and mixed, with only 1 of 3 studies reporting a small benefit that did not reach statistical significance.
  • What dose of Calcium is typically used in studies?
    The only specific effective dose reported across these syntheses is 1000 mg/day or greater, used as calcium carbonate in one study on stillbirth. For bone density outcomes, no consistent effective dose was identified across the studies, and dosing varied or was not reported.
  • Who benefits most from Calcium?
    Postmenopausal women, especially those with osteopenia or osteoporosis, are the most studied population for bone density benefits. For stillbirth reduction, research focuses on pregnant women, including those with prior pre-eclampsia/eclampsia. However, benefits were not consistently observed across all groups, and neutral findings in kidney transplant recipients and women with type 2 diabetes suggest the effects may not generalize.
  • Are there caveats or limitations in the research on Calcium?
    Yes, all three research syntheses are based on small numbers of studies (3-4 each) and the evidence strength is rated as low. Many studies did not reach statistical significance, and beneficial effects were often observed only when calcium was combined with other interventions (exercise or collagen), making it difficult to attribute effects to calcium alone. Outcome measures also varied across studies, such as different sites for bone mineral density assessment.
  • Does Calcium help with increasing bone mineral density?
    The evidence is mixed: 2 of 4 studies on total hip bone mineral density reported beneficial small-to-moderate effects, but these occurred only with combined interventions (exercise or collagen plus calcium and vitamin D). The other 2 studies found neutral effects. In postmenopausal women with osteoporosis, 1 of 3 studies showed a small benefit, while 2 studies in other populations found no effect.

Most-studied combinations with Calcium

most supplement research is combination research
Also studied with:Potassium (2), Phosphorus (2), Zinc (3), Magnesium (3), Iron (2), Vitamin D (11)

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