No information was available on either dose or formulation of the fish oil supplements https://bmjmedicine.bmj.com/content/3/1/e000451 This was an observational study, so no conclusions can be drawn about causal factors, the authors caution https://www.theguardian.com/news/article/2024/may/21/fish-oil-may-increase-risk-of-heart-conditions-and-stroke-study-finds In order to find out how much protection it affords, a team of researchers in China, the US, the UK and Denmark monitored the health of more than 400,000 participants in the UK Biobank for an average of 12 years to estimate the associations between fish oil supplements and new cases of atrial fibrillation (irregular heartbeat); heart attack, stroke, and heart failure; and death in people with no known cardiovascular disease. https://www.youtube.com/watch?v=ric-Lc21JEw <<<❗ The total daily amount of omega-3 fatty acids (EPA + DHA) in the form of food supplements should not exceed 1 g in order to have a minimal positive effect on heart health. More than 1 g daily increases the risk of atrial fibrillation❗