According to the NHS, adults aged between 19 and 64 years need 700mg of calcium every day, and they should be able to get it from their daily diet.

However, most people don't get the required amount of calcium from their diet and resort to supplements. Speaking to NDTV, Dr Prashant Pawar, Consultant Interventional Cardiology at Fortis Hiranandani Hospital, Vashi said, "The role of calcium has often been debated, but studies consistently show that dietary calcium intake is associated with beneficial cardiovascular effects, including protection from hypertension, vascular disease, and stroke."

"More calcium, especially when paired with vitamin D, appears to be protective against coronary heart disease. However, calcium supplements, which rapidly increase circulating calcium levels, have been shown to raise cardiovascular risk."

Calcium Supplements And Cardiovascular Risk

A study published in the journal Nutrients found that calcium supplements were significantly associated with an increased risk of Cardiovascular Disease (CVD) and Congenital Heart Disease (CHD). The study also found that dietary calcium intake of 700-1000 mg per day or supplementary calcium intake of 1000 mg per day significantly increased the risk of CVD and CHD.

Dr Pawar also highlights how calcium-rich foods are different from calcium supplements. He said, "Dietary calcium, found in food products, causes a slower increase in calcium levels, achieving a more physiological calcium balance. As a result, consuming calcium-rich foods has been shown to lower the risk of cardiovascular disease. While dietary calcium from natural food sources is protective against cardiovascular disease, calcium supplements, due to their rapid effect on calcium levels in the blood, are linked with an increased risk of heart diseases."

How Calcium Supplements Increase Cardiovascular Risk?

There are several mechanisms that can explain the increased cardiovascular risk. Read on to know.

Increased Risk Of Heart Attack (Myocardial Infarction)

have found that calcium supplements increase the risk of by 20-30%. This increased risk is likely due to changes in blood calcium levels after the consumption of the supplements, which may cause vascular calcification, leading to heart attacks.

Vascular Calcification And Arterial Stiffness

Calcium supplements have been linked to increased calcification in arteries, including the aorta and coronary arteries. This leads to stiffening of blood vessels, reducing their elasticity and affecting normal vascular function. It can also increase , reduce blood flow and lead to cardiovascular diseases.

Coagulation And Changes In Blood Flow

Increased levels of calcium in the blood may affect blood coagulation pathways and vascular tone. This can increase the risk of formation and alter normal vascular flow, heightening the chances of ischemic cardiovascular events like heart attacks or strokes.

Benefits on Bone Health vs Cardiovascular Damage

Calcium supplements are usually given to improve bone density and prevent fractures. However, with the increased risk of cardiovascular disease, the risk-benefit balance must be analysed.

increase cardiovascular risk by increasing the chances of myocardial infarction through mechanisms involving vascular calcification, altered coagulation, and impaired vascular function. These risks outweigh the limited benefits. This suggests that one should use calcium with caution, especially if you have a risk for cardiovascular disease.