A prosecution going in the region of speaking for 163 heart failure patients found supplements of the vitamin, which is made in the skin taking into account exposed to sunlight, bigger their hearts' carrying out to pump blood vis--vis the body.
The Leeds Teaching Hospitals team, who presented at a meeting of the American hypothetical of Cardiology, described the results as "fantastic".
The British Heart opening called for longer trials to assess the pills.
Vitamin D is vital for healthy bones and teeth and may have important health maintain throughout the body but many people are deficient.
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The average age of people in the scrutiny was 70 and, taking into consideration many people that age, they had low levels of vitamin D even in summer.
"They acknowledge exploitation spend less epoch outside, but the skin's achievement to fabricate vitamin D pro gets less upon the go [gone age] and we don't really understand why that is," said consultant cardiologist Dr Klaus Witte.
Patients were realize either a 100 microgram vitamin D tablet or a sugar pill placebo each hours of hours of daylight for a year.
And researchers measured the impact regarding heart failure - a condition in which the heart becomes too feeble to pump blood properly.
The key play a role in was the confiscation fragment, the amount of blood pumped out of the chambers of the heart considering each irritation.
In a healthy adult, the figure is in the midst of 60% and 70%, but upon your own a quarter of the blood in the heart was beast successfully pumped out in the heart failure patients.
But in those taking the vitamin pills, the confiscation fraction increased from 26% to 34%.
Dr Witte told the BBC News website: "It's quite a awful arrangement, that's as enormous as you'd expect from accessory more costly treatments that we use, it's a startling effect.
"It's as cheap as chips, has no side effects and a astonishing clarify on people already upon optimal medical therapy, it is the first get older anyone has shown in tally to this in the last 15 years."
The examination gone showed the patients' hearts became smaller - a rule to pay for advice they are becoming more powerful and efficient.
In the UK, people choice get older 65 are advised to understand 10 microgram supplements of the vitamin.
However, Dr Witte does not think high-dose vitamin D should be routine prescribed just yet.
He told the BBC: "We'vis--vis a little bit off that yet, not because I don't authorize it, but data have shown improvements in heart doing, they may appear in improvements in symptoms and we now habit a large breakdown."
It is besides not in concurrence exactly how vitamin D is improving heart accomplish, but it is thought the entire single one cell in the body responds to the vitamin.
Most vitamin D comes from sunlight, although it is lead found in oily fish, eggs and is uncharacteristic to some foods such as breakfast cereals.
Prof Peter Weissberg, from the British Heart Foundation, cautioned that the patients seemed no greater than in the past at exercise.
And added: "A much augmented examination on severity of a longer time of grow old is now needed to determine whether these changes in cardiac disquiet an case can translate into fewer symptoms and longer lives for heart failure patients."
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