Vitamin D supplementation is recommended by the NHS during the autumn and winter months, but people might benefit from taking one all year round.
Research published in the British Medical Journal (BMJ) suggested vitamin D supplements might reduce the risk of a heart attack.
In the largest trial of its kind to date, the researchers investigated whether supplementing older adults with vitamin D altered the rate of cardiovascular events.
Involving 21,315 Australians aged 60 to 84, across a five-year period, the participants either received one capsule of 60,000 IU vitamin D monthly or placebo.