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Updated: Feb 22, 2026

A Semi-Automated and Reproducible Biological-Based Method to Quantify Calcium Deposition In Vitro
Published on: June 2, 2022
Calcium and Cardiovascular Disease
Ian R Reid1,2, Sarah M Birstow1, Mark J Bolland1
1Department of Medicine, University of Auckland, Auckland, New Zealand.
Insights
High circulating calcium levels increase vascular disease risk, independent of other factors. Dietary calcium is safer than supplements for cardiovascular health.
Area of Science:
- Cardiovascular Medicine
- Nephrology
- Nutritional Science
Background:
- Elevated circulating calcium is a recognized risk factor for vascular disease, supported by extensive longitudinal studies.
- Potential mediation by other cardiovascular risk factors exists, but an independent effect of serum calcium is suggested.
- Genetic variations in the calcium-sensing receptor linked to higher serum calcium correlate with cardiovascular disease, implying causality.
Purpose of the Study:
- To evaluate the association between circulating calcium levels and vascular disease risk.
- To investigate the role of calcium supplements versus dietary calcium in cardiovascular health.
- To analyze the impact of calcium on mortality and vascular disease progression.
Main Methods:
- Analysis of prospective studies with large participant cohorts and long follow-up periods.
- Review of clinical trials involving calcium supplements in patients with varying degrees of renal function.
- Meta-analyses of randomized controlled trials and observational studies on dietary calcium intake.
Main Results:
- Prospective studies indicate circulating calcium is an independent risk factor for vascular disease.
- Trials in renal failure patients show increased mortality and vascular disease with calcium supplements.
- Meta-analyses suggest adverse cardiovascular effects from calcium supplements, particularly in calcium-naive individuals.
Conclusions:
- Circulating calcium is a significant risk factor for vascular disease.
- Dietary calcium intake is preferable to calcium supplements for cardiovascular health.
- High calcium intake, especially from supplements, may accelerate vascular disease and increase mortality.
Abstract:
Circulating calcium is a risk factor for vascular disease, a conclusion arising from prospective studies involving hundreds of thousands of participants and extending over periods of up to 30 years. These associations may be partially mediated by other cardiovascular risk factors such as circulating lipid levels, blood pressure, and body mass index, but there appears to be a residual independent effect of serum calcium. Polymorphisms of the calcium-sensing receptor associated with small elevations of serum calcium are also associated with cardiovascular disease, suggesting that calcium plays a causative role. Trials of calcium supplements in patients on dialysis and those with less severe renal failure demonstrate increased mortality and/or acceleration of vascular disease, and meta-analyses of trials in those without overt renal disease suggest a similar adverse effect. Interpretation of the latter trials is complicated by a significant interaction between baseline use of calcium supplements and the effect of randomisation to calcium in the largest trial. Restriction of analysis to those who are calcium-naive demonstrates a consistent adverse effect. Observational studies of dietary calcium do not demonstrate a consistent adverse effect on cardiovascular health, though very high or very low intakes may be deleterious. Thus, obtaining calcium from the diet rather than supplements is to be encouraged.
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