Dialysis patients face some of the highest cardiovascular risk of any patient group. Their kidneys no longer filter waste, so they spend hours each week tethered to machines that do the work instead. Now a large international trial offers them something concrete: a daily fish oil supplement that cuts serious heart complications by 43 percent.
The study, called PISCES, followed dialysis patients across multiple countries who took four grams of fish oil daily—essentially high-dose omega-3 fatty acids EPA and DHA. Over the trial period, those taking the supplement experienced significantly fewer heart attacks, strokes, cardiac deaths, and vascular amputations compared to those on placebo. For a population where few proven interventions exist, this matters.
"In a field where many trials have been negative, this is a significant finding," says Professor Kevan Polkinghorne, a nephrologist at Monash Health in Australia, where about 200 of the trial's participants were treated. The reason the benefit appears so dramatic in this group is straightforward: dialysis patients typically have depleted levels of omega-3 fatty acids, the protective compounds fish oil provides. Their bodies are simply running on empty in this particular nutrient.
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Start Your News DetoxThe research was led internationally by Professor Charmaine Lok's team at the University Health Network in Toronto and the University of Calgary, with the Australian arm funded by the National Health and Medical Research Council. The scale of the trial—involving hundreds of patients across multiple sites—gives the findings real weight. This isn't a small pilot study or preliminary data. It's the kind of evidence that can shift clinical practice.
Here's what matters just as much as the result: the researchers were careful to say this applies specifically to dialysis patients. They didn't overreach. The benefit doesn't extend to healthy people taking fish oil supplements, nor to other kidney disease populations not yet on dialysis. That restraint is actually reassuring—it suggests the team understands their data and isn't chasing headlines.
For the roughly 2 million people worldwide on dialysis, many of whom live with the constant awareness that their cardiovascular risk is exceptionally high, this offers a straightforward option. A daily supplement. No invasive procedure, no complex medication regimen layered on top of their existing treatment. Just a measurable reduction in the events that worry them most.
