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Medical professionals frequently prescribe calcium supplements to manage bone health in aging populations. However, a new population-based cohort study published in the Journal of the American Heart Association (JAHA) raises significant concerns regarding calcium supplementation CVD risk for patients with established cardiovascular disease. Researchers analyzed data from over 35,000 patients in Hong Kong to investigate the safety of these supplements in individuals already diagnosed with heart conditions.
The study followed individuals aged 40 and older who were newly diagnosed with cardiovascular disease (CVD) between 2006 and 2015. Using propensity score matching, the researchers compared 17,720 patients prescribed calcium supplements with an equal number of controls who never used them. Consequently, this method allowed the team to balance baseline characteristics and focus strictly on the impact of the supplement itself on long-term outcomes.
The results revealed that patients taking calcium supplements faced a 10% higher risk of experiencing a recurrence of adverse cardiovascular events. Furthermore, these patients had a 16% higher likelihood of requiring hospitalization or emergency department attendance related to CVD. Specifically, the data showed that calcium supplementation CVD risk was most pronounced in those using calcium monotherapy compared to those taking combined calcium and vitamin D formulations.
Patients using calcium only had a 21% increased risk of recurrence. In contrast, those taking a combination of calcium and vitamin D showed no significant increase in risk. Additionally, the study observed a stronger association in men, who faced a 15% increased risk, compared to a 7% increased risk in women. These findings suggest that the metabolic handling of supplemental calcium might differ significantly based on gender and the presence of vitamin D.
Clinicians should consider these findings when treating patients with existing heart disease. While calcium is vital for bone density, the potential for accelerated vascular calcification remains a concern. Therefore, doctors may need to prioritize dietary calcium intake or ensure adequate vitamin D co-supplementation for high-risk cardiac patients. Careful monitoring and individualized risk assessment are essential when prescribing these supplements in clinical practice.
No, most studies suggest that dietary calcium from food sources is not associated with increased cardiovascular risk. Unlike supplements, which cause a rapid spike in blood calcium levels, dietary calcium is absorbed more slowly and does not appear to promote vascular calcification in the same manner.
Yes, according to this study, the combination of calcium and vitamin D was not associated with a significantly increased risk of CVD recurrence. Vitamin D may help regulate calcium metabolism and reduce the potential for adverse vascular effects.
The study found a more pronounced risk in men than in women. Men with established cardiovascular disease should exercise extra caution and discuss the necessity of calcium monotherapy with their physician, potentially exploring alternatives or combination therapies.
Disclaimer: This content is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions you may have regarding a medical condition. Refer to the latest local and national guidelines for clinical practice.
References
Zhang X et al. Association Between Calcium Supplementation and Recurrence of Cardiovascular Events in Patients With Cardiovascular Disease: A Population-Based Cohort Study. J Am Heart Assoc. 2026 Apr 09. doi: 10.1161/JAHA.125.047455. PMID: 41954050.
Bolland MJ, et al. 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. BMJ. 2011;342:d2040.
Myung SK, et al. Calcium Supplements and Risk of Cardiovascular Disease: A Meta-Analysis of Clinical Trials. Nutrients. 2021;13(2):368.
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