Taking melatonin supplements appears to help heart failure patients feel better and lower stress markers in their heart, but it doesn't reliably improve the heart's pumping strength.

Taking 10 mg of melatonin every night for six months can help people with a specific type of heart condition feel better and have fewer heart failure flare-ups. This improvement comes from better daily well-being and fewer hospital visits, rather than from preventing death.

Taking 10 mg of melatonin every day for six months helps heart failure patients feel better and live more comfortably, according to a study comparing it to a placebo.

Taking melatonin pills for heart failure patients doesn't seem to help their hearts pump blood better. Research shows that adding melatonin to their treatment doesn't make a meaningful difference in how well their hearts work compared to just taking a placebo.

Taking melatonin supplements every day for a couple of months might help people with heart failure feel better physically and mentally. Studies show that compared to a fake pill, those who took melatonin reported noticeably better quality of life scores.

Taking 10 mg of melatonin every night for six months does not improve heart pumping ability or change heart size in people with a specific type of chronic heart failure.