The community is debating the reality of the risk of heart rhythm disorders linked to omega-3 supplements, suggesting that previous warnings could be due to statistical errors or very high doses.

noli's read

Scientific literature presents a contrasting situation: while high levels of circulating omega-3s are associated with better heart health, clinical trials (RCTs) have indeed raised concerns regarding an increased risk of atrial fibrillation (Meta-analysis, 2021). However, a recent analysis in the Journal of the American Heart Association (2025) suggests that the association observed in certain observational studies could be a statistical artifact linked to a failure to properly account for age. The risk signal appears to be concentrated almost exclusively on very high pharmaceutical doses (greater than 1g/day), which does not reflect typical consumption via diet or standard supplements. It is therefore highly possible that the risk is nonexistent at common nutritional doses. The scientific community on Reddit is converging on a cautious interpretation, acknowledging the validity of the risk at high doses while questioning its generalization to typical supplement users.

the sources

1. 1NIH Office of Dietary Supplements 2026
2. 2Manson JE et al. 2019
3. 3Bhatt DL et al. 2019
4. 4r/ScientificNutrition