Nezam El-Tayebat Fact CheckA scientific assessment of the “نظام الطيبات” nutrition system
Choose country

Unclear / insufficient evidence Certainty of evidence: low provisional C-SUP-04

Calcium supplements without vitamin D raise the risk of myocardial infarction by about 31%, and adding vitamin D does not remove this harm.

Conclusion: Unclear: a heart-attack risk from calcium pills is suggested by some analyses but not confirmed by others.
  1. Original statement
  2. Scientific assessment
  3. In plain language
  4. Studies on this claim
  5. Regional context
  6. What applies in my country?
  7. References

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).

6. Which studies contradict it?

Chung 2016 (I-SUP-06); 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
25 October 2026 provisional

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 (2)

  • Calcium pills and heart attacks

    Bolland MJ et al.. BMJ 2010 · PMID 20671013 · DOI 10.1136/bmj.c3691
    Meta-analysiscited by the Tayebat archivefull text checked★ key study

    In 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.

    Scientific details →

  • Calcium + vitamin D and heart attacks (WHI reanalysis)

    Bolland MJ et al.. BMJ 2011 · PMID 21505219 · DOI 10.1136/bmj.d2040
    Meta-analysiscited by the Tayebat archiveabstract only checked

    In 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.

    Scientific details →

Studies contradicting or limiting the claim (2)

  • Calcium and heart disease – updated review

    Chung M et al.. Ann Intern Med 2016 · PMID 27776363 · DOI 10.7326/M16-1165
    Meta-analysisindependent cross-checkabstract only checked★ key study

    No 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.

    Scientific details →

  • Vitamins and heart disease – overview

    Jenkins DJA et al.. J Am Coll Cardiol 2018 · PMID 29852980 · DOI 10.1016/j.jacc.2018.04.020
    Meta-analysiscited by the Tayebat archiveabstract only checked

    Mostly 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.

    Scientific details →

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.2011.445
    Cohort studycited by the Tayebat archivefull text checked★ key study

    Several 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.

    Scientific details →

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

  1. 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
  2. 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
  3. 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
  4. 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
  5. 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

← Back to overview