Calcium supplements without vitamin D raise the risk of myocardial infarction by about 31%, and adding vitamin D does not remove this harm.
Original statement
ففي تحليل بولاند ورفاقه عام 2010 المنشور في BMJ، رفعت مكملات الكالسيوم دون فيتامين د خطر احتشاء عضلة القلب بنسبة 31%، وأكدت إعادة تحليل WHI عام 2011 أن إضافة فيتامين د لا تُلغي هذا الضرر.
not verbatim – paraphrase. Translation by the project; the Arabic wording is authoritative.
Translation
Calcium supplements without vitamin D raise the risk of myocardial infarction by about 31%, and adding vitamin D does not remove this harm.
Origin
- Source status
- Archive editors
- Attribution
- Archive editors (eltayebat.com); not verified as Elawady's own words
- Origin
- https://eltayebat.com/rule/oral-supplements/
- Attribution uncertainty
- Written by the archive operators; study selection is the archive's, not necessarily Elawady's.
- Claimed mechanism
Not specified (proposed: transient hypercalcaemia).
- Claimed health effect
Myocardial infarction, stroke.
- Population concerned
Older adults taking calcium supplements.
- Geographic restriction by Elawady
none found
Scientific assessment
Unclear / insufficient evidence – The data do not allow an assessment either way.
Certainty of evidence: low – Further research is likely to change the assessment considerably.
1. What was claimed?
Calcium pills raise heart attack risk; vitamin D does not help.
2. What is demonstrably correct?
Bolland 2010 (A-SUP-01): calcium supplements without vitamin D, 143 vs 111 MIs (HR 1.31, P=0.035), about one extra MI per 69 people treated for five years (about 14 per 1,000); the excess was confined to people with dietary calcium above the median of 805 mg/day (HR 1.85 vs 0.98; P for interaction 0.01). Bolland 2011 (A-SUP-02): calcium ± vitamin D RR 1.24 (1.07–1.45) for MI in trial-level analysis.
3. What is wrong or exaggerated?
A-SUP-01 excluded calcium-plus-vitamin-D versus placebo trials, so it cannot support the statement that adding vitamin D does not remove the harm; that part rests on A-SUP-02 only. Contested: the finding relies on secondary outcomes and subgroup reanalyses (excluding WHI women already using calcium); Chung 2016 found no association within tolerable intake levels. The archive's own cited Iowa study found calcium associated with lower mortality (HR 0.91), which the archive does not mention.
4. What remains unclear?
Whether a small risk exists with high-dose supplements remains debated.
5. Which studies support it?
A-SUP-01 (calcium alone; MI excess only with dietary calcium above 805 mg/day), A-SUP-02 (calcium with or without vitamin D), Myung 2021 (I-SUP-110; CVD RR 1.15), Yang 2020 (I-SUP-111; MI RR 1.14, calcium alone 1.21; one reported CI appears erroneous).
6. Which studies contradict it?
Chung 2016 (I-SUP-06); Sim 2023 (I-SUP-112; 12 RCTs, no association with MI, stroke or mortality, also for calcium alone); A-SUP-06 (calcium inverse association); A-SUP-29 (no effect for calcium on CVD).
7. What applies to Germany and Europe?
Applies equally.
8. What is known about Egypt?
Applies equally.
9. What practical conclusion is appropriate?
Prefer dietary calcium where possible; when supplements are indicated (e.g. osteoporosis treatment with low intake), the possible cardiovascular risk is uncertain and should not be overstated.
Assessment details
- Rationale for certainty of evidence
Bolland's patient-level meta-analysis (HR 1.31, 1.02–1.67) and WHI reanalysis suggested a modest increase; cardiovascular outcomes were secondary end points, partly self-reported. An independent updated systematic review (Chung 2016, 4 RCTs low risk of bias, 27 observational studies) found calcium within tolerable upper intake levels not associated with CVD risk. The Iowa cohort cited by the archive found calcium use inversely associated with mortality.
- Source quality
Archive correctly reports Bolland's numbers but presents a contested finding as settled.
- Regional transferability
High.
- Individual exceptions
Calcium from food is not implicated.
- Regional scope of the claim
- general (biological/medical)
- Last reviewed
- 26 October 2026 provisional
Scientific evidence in detail
Overinterpreted – A real finding exists, but the claim draws more from it than the data allow (e.g. association taken as cause, animal data applied to humans, small effect presented as large).
Research question: In adults (mainly older women), do calcium supplements without vitamin D increase myocardial infarction by about 31%, and does adding vitamin D fail to remove this risk?
Research question in detail (PICO)
- Population
- Older adults, mainly postmenopausal women
- Intervention or exposure
- Calcium supplements with or without vitamin D
- Comparison
- Placebo
- Geographic scope
- universal biology
- Outcomes
- Myocardial infarction
- CVD events
Study results as reported by the authors. Our assessment follows below.
What speaks for the claim?
Calcium pills and heart attacks
Bolland MJ et al.. BMJ 2010 · PMID 20671013 · DOI 10.1136/bmj.c3691 Meta-analysisfull text, structured risk-of-bias assessmentBolland patient-level meta-analysis: calcium without vitamin D increased MI.
- Actual result
- MI HR 1.31 (1.02-1.67).
- Methodological quality
- moderate (MI secondary outcome in source trials)
- Relevance
- direct
- Limitations
- Excess only with dietary calcium >805 mg/day.
Calcium pills and heart disease: meta-analysis
Myung SK et al.. Nutrients 2021 · PMID 33530332 · DOI 10.3390/nu13020368 Meta-analysisabstract checkednewly addedMyung 2021: 13 double-blind RCTs; calcium supplements increased CVD and CHD.
- Actual result
- CVD RR 1.15 (1.06-1.25); CHD 1.16 (1.05-1.28).
- Methodological quality
- moderate
- Relevance
- direct
- Limitations
- Overlapping trials; secondary outcomes.
Calcium from food vs pills and heart disease
Yang C et al.. J Am Coll Nutr 2020 · PMID 31625814 · DOI 10.1080/07315724.2019.1649219 Meta-analysisabstract checkednewly addedYang 2020: calcium supplements increased MI, more with calcium alone; dietary calcium neutral.
- Actual result
- MI RR 1.14 (1.05-1.25); calcium alone 1.21 (1.08-1.35).
- Methodological quality
- moderate (one CI appears misreported)
- Relevance
- direct
- Limitations
- Overlap.
What speaks against the claim?
Calcium pills and heart disease: no link found
Sim MG et al.. Heart Lung Circ 2023 · PMID 37743221 · DOI 10.1016/j.hlc.2023.07.008 Meta-analysisabstract checkednewly addedSim 2023: 12 RCTs; no association with MI, stroke or mortality, including calcium alone.
- Actual result
- Not associated (estimates not in abstract).
- Methodological quality
- moderate
- Relevance
- direct
- Limitations
- Abstract lacks numbers.
Calcium and heart disease – updated review
Chung M et al.. Ann Intern Med 2016 · PMID 27776363 · DOI 10.7326/M16-1165 Meta-analysisabstract checkedChung 2016 (AHRQ-type review): no CVD effect of calcium within tolerable intake.
- Actual result
- No significant differences in RCTs.
- Methodological quality
- moderate-high
- Relevance
- direct
- Limitations
- Few RCTs with CVD outcomes.
What does the overall evidence say?
Editorial assessment based on the studies above – not itself a study result.
Which position is better supported?
Genuinely unresolved: overlapping meta-analyses of the same trials disagree.
Why some studies weigh more
Meta-analyses share trials and are not independent; disagreements stem from trial selection and outcome definitions.
Is a causal relationship established? Possible, not established Randomised data but CVD was a secondary, partly self-reported outcome.
Remaining uncertainty
Whether a small MI risk exists, especially with high dietary calcium.
Justified conclusion
A modest risk is possible; presenting a 31% increase as established and stating that vitamin D does not remove it overstates the evidence.
Why do studies seem to disagree?
Same pool of trials, different inclusion (e.g. WHI participants already using calcium), outcome definitions and analysis level (patient vs trial) explain discrepant meta-analyses.
Does this depend on the country?
- General biological effects
- Same human physiology everywhere.
- Eating habits
- Supplement use patterns differ by country; not region-specific for this question.
- Origin of the food
- Not relevant.
- Contaminants
- Product quality and contamination vary by market (not assessed here).
- National production conditions
- Not relevant.
- Legal rules
- Supplements are regulated as foods in the EU; Egyptian rules not verified.
- Actual monitoring data
- No monitoring data reviewed.
A regional difference that changes the conclusion is not supported by robust data.
Statistical re-check
- Log-symmetry of reported CIs – CHD RR 1.08 (1.02-1.22): upper log distance 2.1x lower - likely reporting error; MI estimates consistent. recalculated
- Log-symmetry – CVD 1.15 (1.06-1.25) symmetric. recalculated
Certainty of the overall evidence (GRADE, simplified)
- Main outcome
- Myocardial infarction with calcium supplements
- Starting level
- high (randomised trials)
- Reasons for downgrading
- inconsistency (conflicting meta-analyses)
- indirectness (CVD secondary outcomes)
- risk of bias (self-reported events)
- Result
- low
Simplified assessment by a single reviewer, following the GRADE approach; not a formal GRADE panel. GRADE rates the body of evidence for one outcome, not individual studies.
Search strategy
Documented literature searches for this review (search strings in the original database syntax).
| Database | Date | Search | Looking for | Hits | Included |
|---|---|---|---|---|---|
| Europe PMC | 26 October 2026 | TITLE:calcium AND (TITLE:supplement*) AND (TITLE:cardiovascular OR TITLE:"myocardial infarction" OR TITLE:"coronary") AND (PUB_TYPE:"Meta-Analysis" OR PUB_TYPE:"Systematic Review") AND PUB_YEAR:[2016 TO 2026] | both directions | 6 |
Open questions
Individual patient data analysis with adjudicated CVD outcomes.
How deeply was this checked?
8 linked studies: 2 checked in full text (2 of them with a structured risk-of-bias assessment), 6 on the basis of the abstract, 0 bibliographically only. No formal assessment with two independent reviewers and no independent human expert review has taken place yet.
Last scientific review: 26 October 2026
History of the verdict
- 25 October 2026 · Phase 1 · Initial assessment: Unclear / insufficient evidence (low)
- 26 October 2026 · Phase 4 (systematic evidence review) · Re-examined with extended evidence; verdict unchanged: Unclear / insufficient evidence (low)
Two newer meta-analyses support a modest risk and one finds none; the conflict persists.
New sources: I-SUP-110 I-SUP-111 I-SUP-112
In plain language
Some analyses found slightly more heart attacks among people taking calcium pills. Other careful reviews did not find this. So the question is still open. Calcium from food is not a concern.
Studies on this claim
Studies supporting the claim (4)
-
Calcium pills and heart attacks
Bolland MJ et al.. BMJ 2010 · PMID 20671013 · DOI 10.1136/bmj.c3691Meta-analysiscited by the Tayebat archivefull text, structured risk-of-bias assessment★ key studyIn trials, people taking calcium had 31% more heart attacks than with placebo (143 vs 111 events).
Does the study support the specific claim? Partly · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
CV risk of calcium.
- How was the study done?
Meta-analysis of RCTs.
- How many people, animals or samples were studied?
~20,000.
- What was actually found?
More MIs.
- How large was the observed effect?
HR 1.31.
- What do the results mean in everyday life?
Possible small risk.
- What are the study's limitations?
Secondary outcomes.
- What does it say about Elawady's specific claim?
Partly supports.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Certainty of harm.
-
Calcium + vitamin D and heart attacks (WHI reanalysis)
Bolland MJ et al.. BMJ 2011 · PMID 21505219 · DOI 10.1136/bmj.d2040Meta-analysiscited by the Tayebat archiveabstract checkedIn women not already using calcium, calcium plus vitamin D was linked to about 13–22% more CV events.
Does the study support the specific claim? Partly · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
CaD and CV.
- How was the study done?
Reanalysis + MA.
- How many people, animals or samples were studied?
WHI + 8 trials.
- What was actually found?
Modest increase.
- How large was the observed effect?
RR 1.24 MI.
- What do the results mean in everyday life?
Uncertain.
- What are the study's limitations?
Post-hoc.
- What does it say about Elawady's specific claim?
Partly supports.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Settled harm.
-
Calcium pills and heart disease: meta-analysis
Myung SK et al.. Nutrients 2021 · PMID 33530332 · DOI 10.3390/nu13020368Meta-analysisindependent cross-checkabstract checkedPooling 13 placebo-controlled trials, calcium pills were linked to about 15% more cardiovascular disease, mainly in healthy postmenopausal women.
RR 1.15 for CVD with calcium supplements in double-blind RCTs; includes calcium with vitamin D.
Does the study support the specific claim? Yes · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
To check whether calcium pills raise heart disease risk.
- How was the study done?
Meta-analysis of double-blind trials.
- How many people, animals or samples were studied?
13 trials, about 43,000 people.
- What was actually found?
About 15% more CVD and CHD.
- How large was the observed effect?
CVD RR 1.15 (1.06-1.25).
- What do the results mean in everyday life?
Calcium pills may slightly raise heart risk.
- What are the study's limitations?
Heart outcomes were not the main aim of the trials.
- What does it say about Elawady's specific claim?
Supports the direction of C-SUP-04.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Does not settle the question; other analyses disagree.
-
Calcium from food vs pills and heart disease
Yang C et al.. J Am Coll Nutr 2020 · PMID 31625814 · DOI 10.1080/07315724.2019.1649219Meta-analysisindependent cross-checkabstract checkedCalcium from food was not linked to heart disease, but calcium pills were linked to about 14% more heart attacks in trials.
MI RR 1.14 overall and 1.21 with calcium alone; dietary calcium not associated.
Does the study support the specific claim? Partly · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
To compare food calcium and calcium pills for heart risk.
- How was the study done?
Meta-analysis of cohorts and trials.
- How many people, animals or samples were studied?
26 cohorts, 16 trials.
- What was actually found?
Food calcium neutral; pills linked to more heart attacks.
- How large was the observed effect?
MI RR 1.14 (1.05-1.25).
- What do the results mean in everyday life?
If calcium is needed, food sources are not linked to heart risk.
- What are the study's limitations?
One reported interval looks erroneous; overlapping data.
- What does it say about Elawady's specific claim?
Supports the direction of C-SUP-04.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Cannot prove that calcium pills cause heart attacks.
No study in this group is marked as key.
Studies contradicting or limiting the claim (3)
-
Calcium and heart disease – updated review
Chung M et al.. Ann Intern Med 2016 · PMID 27776363 · DOI 10.7326/M16-1165Meta-analysisindependent cross-checkabstract checked★ key studyNo link between calcium intake within upper limits and heart disease.
Does the study support the specific claim? No · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Calcium and CVD.
- How was the study done?
SR/MA.
- How many people, animals or samples were studied?
4 RCTs, 27 cohorts.
- What was actually found?
No association.
- What do the results mean in everyday life?
Calcium pills probably not a heart risk.
- What are the study's limitations?
COI; secondary outcomes.
- What does it say about Elawady's specific claim?
Contradicts C-SUP-04.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Very high intakes.
-
Vitamins and heart disease – overview
Jenkins DJA et al.. J Am Coll Cardiol 2018 · PMID 29852980 · DOI 10.1016/j.jacc.2018.04.020Meta-analysiscited by the Tayebat archiveabstract checkedMostly no effect; folic acid may reduce stroke; antioxidant mixtures may increase mortality.
Does the study support the specific claim? Partly · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
CVD prevention.
- How was the study done?
Meta-analyses.
- How many people, animals or samples were studied?
Many RCTs.
- What was actually found?
Mostly null.
- How large was the observed effect?
not in abstract
- What do the results mean in everyday life?
Selective use.
- What are the study's limitations?
Abstract only.
- What does it say about Elawady's specific claim?
Mixed.
- Do the results apply to Germany and Europe?
Applicable.
-
Calcium pills and heart disease: no link found
Sim MG et al.. Heart Lung Circ 2023 · PMID 37743221 · DOI 10.1016/j.hlc.2023.07.008Meta-analysisindependent cross-checkabstract checkedA 2023 review of 12 trials found no link between calcium pills and heart attacks, strokes or deaths.
No association of calcium supplements with MI or mortality in 12 RCTs, also for calcium alone.
Does the study support the specific claim? No · Methodological quality: moderate · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
To check calcium pills and heart risk in trials.
- How was the study done?
Meta-analysis of randomised trials.
- How many people, animals or samples were studied?
12 trials.
- What was actually found?
No link with heart attack, stroke or death.
- How large was the observed effect?
Not given in abstract.
- What do the results mean in everyday life?
The heart risk of calcium pills, if any, is uncertain.
- What are the study's limitations?
Abstract lacks numbers.
- What does it say about Elawady's specific claim?
Contradicts C-SUP-04.
- Do the results apply to Germany and Europe?
Applicable.
- What can explicitly not be concluded from this study?
Cannot exclude a small risk.
No study in this group is marked as key.
Studies with mixed or unclear results (1)
-
Supplements and mortality in older women
Mursu J et al.. Arch Intern Med 2011 · PMID 21987192 · DOI 10.1001/archinternmed.2011.445Cohort studycited by the Tayebat archivefull text, structured risk-of-bias assessment★ key studySeveral supplements were linked to slightly more deaths; calcium to fewer.
Does the study support the specific claim? Partly · Methodological quality: low · Certainty of evidence: see overall assessment of the claim
Original publication · Scientific details
Study explained simply
- What did the researchers want to find out?
Mortality with supplements.
- How was the study done?
Cohort.
- How many people, animals or samples were studied?
38,772 women.
- What was actually found?
Small associations both ways.
- How large was the observed effect?
HR 1.06 (MV), 0.91 (Ca).
- What do the results mean in everyday life?
Not proof of harm.
- What are the study's limitations?
Confounding.
- What does it say about Elawady's specific claim?
Partly supports; contradicts calcium claim.
- Do the results apply to Germany and Europe?
Moderate.
- What can explicitly not be concluded from this study?
Causation.
No study in this group is marked as key.
Regional context
Germany / EU
Applies equally.
Egypt
Applies equally.
What applies in my country?
General scientific assessment
Unclear / insufficient evidence Unclear: a heart-attack risk from calcium pills is suggested by some analyses but not confirmed by others.
This statement concerns biological or medical relationships. The scientific assessment above applies regardless of the country; country-specific food data do not change it.
References
- Effect of calcium supplements on risk of myocardial infarction and cardiovascular events: meta-analysis.. Bolland MJ et al.. BMJ 2010 · PMID 20671013 · DOI 10.1136/bmj.c3691
- Calcium supplements with or without vitamin D and risk of cardiovascular events: reanalysis of the Women's Health Initiative limited access dataset and meta-analysis.. Bolland MJ et al.. BMJ 2011 · PMID 21505219 · DOI 10.1136/bmj.d2040
- Calcium Supplements and Risk of Cardiovascular Disease: A Meta-Analysis of Clinical Trials.. Myung SK et al.. Nutrients 2021 · PMID 33530332 · DOI 10.3390/nu13020368
- The Evidence and Controversy Between Dietary Calcium Intake and Calcium Supplementation and the Risk of Cardiovascular Disease: A Systematic Review and Meta-Analysis of Cohort Studies and Randomized Controlled Trials.. Yang C et al.. J Am Coll Nutr 2020 · PMID 31625814 · DOI 10.1080/07315724.2019.1649219
- Calcium Intake and Cardiovascular Disease Risk: An Updated Systematic Review and Meta-analysis.. Chung M et al.. Ann Intern Med 2016 · PMID 27776363 · DOI 10.7326/M16-1165
- Supplemental Vitamins and Minerals for CVD Prevention and Treatment.. Jenkins DJA et al.. J Am Coll Cardiol 2018 · PMID 29852980 · DOI 10.1016/j.jacc.2018.04.020
- Association Between Calcium Supplementation and the Risk of Cardiovascular Disease and Stroke: A Systematic Review and Meta-Analysis.. Sim MG et al.. Heart Lung Circ 2023 · PMID 37743221 · DOI 10.1016/j.hlc.2023.07.008
- Dietary supplements and mortality rate in older women: the Iowa Women's Health Study.. Mursu J et al.. Arch Intern Med 2011 · PMID 21987192 · DOI 10.1001/archinternmed.2011.445