Are calcium supplements bad for your heart?
Calcium supplements may be associated with an increased heart risk, but not all studies confirm this. It is best to get calcium from your diet, and discuss with your doctor whether a supplement is truly necessary for you.
Calcium supplements may be bad for your heart, but the evidence is not clear-cut. Many studies combined found a 27 to 31% increased risk of heart attack and a 15 to 16% increased risk of cardiovascular disease, particularly in healthy women after menopause. However, a more recent analysis from 2023 (12 studies) found no clear link, including for stroke, heart failure or death. So the studies do not fully contradict each other, but they do not speak with one voice either.
Striking is the difference with calcium from food. Large population studies find no clear link between dietary calcium and an increased heart risk. A supplement delivers a large amount of calcium into your blood all at once; food provides a slow, gradual absorption. It is thought that this spike in your blood contributes to calcium deposits in blood vessels, but this has not been definitively proven.
Beyond the possible heart risk, calcium supplements raise the risk of kidney stones by around 17%, and the risk of hospital admission due to digestive complaints doubles. At the same time, the evidence that supplements prevent bone fractures is weak: several large studies found no fracture prevention, and for hip fractures evidence is almost entirely absent. The label shows how much elemental calcium a tablet contains, for example 500 mg or 1000 mg, sometimes combined with vitamin D. Whether you choose calcium carbonate or calcium citrate makes little difference for the effect on bones. One thing that does not matter: your previously measured vitamin D level does not predict whether you will benefit more from a supplement.
What does this mean for you? If you have no demonstrated calcium deficiency, the benefits are small and the risks are real. It is best to get calcium from a varied diet, such as dairy, legumes and green vegetables. If you have been prescribed calcium supplements, for example for your bone health after menopause, discuss with your doctor whether the dose and the need are still appropriate: in studies, postmenopausal women received 1000 to 1200 mg of calcium per day, preferably combined with 800 IU of vitamin D, for at least 12 to 24 months.
This answer is based on several large analyses that brought together results from many studies comparing supplements against a dummy pill, including one analysis with more than 43,000 participants. The findings on heart risk are not consistent: earlier analyses found a clearly increased risk, while the most recent one (2023) did not. The researchers themselves identify inconsistency between studies as a core problem. For kidney stones, digestive risk and the absence of fracture prevention, the evidence is more consistent. The evidence on calcium from food is thinner and is based on population research that cannot prove cause and effect.
Is a calcium score of my heart worth doing?
For people between 40 and 75 years old in a grey zone regarding statins, a calcium score is a well-supported tool for making a well-considered decision about medication together with your doctor.
Is a high homocysteine level bad for my heart?
High homocysteine is clearly associated with a greater risk of heart disease. Whether you lower the level with B vitamins makes no difference to your heart risk, at least for now.
Is coffee good or bad for your heart?
For most healthy adults, three to four filtered cups per day is associated with a beneficial effect on the heart and blood vessels. Pregnant women are an important exception: for them, the maximum is around two cups per day.
Does unhealthy gums affect my heart?
People with serious gum disease show clearly higher risks of heart attack, stroke and premature death in large-scale research. Whether that association is causal is not yet certain, but keeping your gums healthy is worthwhile regardless.
How much calcium do I need per day, and can too much be harmful?
Calcium requirements range from 800 mg (young children) to 1500 mg per day (older adults, teenagers, postmenopausal women). Up to 2000 mg per day is safe for most people; aim to get calcium from food wherever possible.
Do you really need calcium supplements for strong bones?
Whether you need calcium supplements depends strongly on your age and situation: for healthy women before the menopause there is no evidence of benefit, while women over 50 may benefit from calcium plus vitamin D, provided you weigh the increased risk of kidney stones and the uncertain cardiac risk with your doctor.