Your Genes May Influence How Much Fish Oil Raises Your Omega-3 Levels
This large genetic study looked at whether a person’s inherited tendency toward low blood omega-3 levels changes how much fish oil supplements actually raise those levels. Researchers built genetic risk scores predicting baseline omega-3 and DHA levels, then tested these scores in over 400,000 people from multiple ancestry groups.
They found that fish oil supplementation was linked to increases in circulating omega-3 fatty acids for everyone, but the size of that increase depended on genetics. People whose genetic profile predicted naturally lower omega-3 levels saw a noticeably bigger boost from supplementation compared to those with a genetic predisposition toward higher levels. In fact, the increase was over 40% larger in the lowest genetic-score group compared to the highest.
This pattern held up in people of European and Central/South Asian ancestry, and was confirmed using other measures of omega-3 intake, such as reported fish consumption and dietary intake, supporting the idea that this isn’t just a fluke of one dataset.
What this means for you
This research suggests that how much your blood omega-3 levels rise after taking fish oil may partly depend on genetics you were born with, not just the dose you take. It hints at a future where nutrition advice could be more personalized based on genetic testing, though this study doesn’t tell you what your own genes predict or what dose is ‘right’ for you.
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Clinical nutrition (Edinburgh, Scotland) · 2026-08-28 · DOI: 10.1016/j.clnu.2026.106774
Read the original source ↗This summary is for educational purposes only and is not medical advice. Always talk to your healthcare provider before making changes to your supplement routine.