Vitamin D Linked to Lower Heart Risk
Studies Show Supplements of Vitamin D May Help Protect Against Heart Disease
March 1, 2010 -- Vitamin D supplements may not only help your bones, they may help protect your heart.
A new review of research on vitamin D and calcium supplements shows that people who take moderate to high doses of vitamin D have a lower risk of heart disease. Calcium supplements seemed to have little effect on heart disease risk.
Vitamin D is produced by the body in response to exposure to sunlight but is also commonly found in fortified dairy products and supplements. It is already known to play a critical role in calcium absorption and bone health, but a growing number of studies suggest that vitamin D supplementation may also lower the risk of heart disease.
Researchers say vitamin D and calcium deficiency is a common problem among the elderly throughout the world. In the United States, the Institute of Medicine recommends vitamin D supplements at a dose of 400 to 600 International Units (IU) per day and calcium at a dose of 1,200 milligrams per day for adults over age 50.
But recent research suggests that significantly higher doses of vitamin D may be required to reap the maximum health benefits of vitamin D supplements.
To help clarify the role of vitamin D and calcium in heart disease risk, researchers analyzed 17 studies published between 1966 and 2009 on vitamin D and calcium supplementation and heart disease. The results appear in the Annals of Internal Medicine.
Researchers found six studies (five of which involved people on dialysis and one which included the general population) showed a consistent reduction in heart-related deaths among people who took vitamin D supplements. But four studies of initially healthy individuals found no differences in development of heart disease between those who received calcium supplements and those who did not.
A second analysis of eight studies showed a slight, but statistically insignificant 10% reduction in heart disease risk among those who took moderate to high doses of vitamin D supplements. No such reduction in heart disease risk was found among those who took calcium or a combination of calcium and vitamin D supplements.