Is fish oil always good for your brain?

A new study found one scenario in which it might not be.

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Today’s Ingredients If there’s one supplement most of us assume is universally good, it’s fish oil. But a new study found that one type of omega-3 may actually interfere with brain repair after head injuries. However, this may not be the case for most people. Below, we break down what the research found and what it means for you.   • Food to enjoy: Strawberry banana breakfast bars   • News to know: Eating eggs 5 times a week linked to lower Alzheimer's risk in new study   • Tips to live well: 7 scrumptious drinks that are high in iron Let’s look into it, Tim Snaith Newsletter Editor, Healthline   Written by Tim Snaith May 21, 2026 • 2 min read FRESH FINDINGS Don’t ditch your fish oil yet Omega-3 fatty acids are linked to heart health, reduced inflammation, and better brain function — DHA in particular is essential for your brain throughout life. So a new study that found one omega-3 might actually hinder the brain got our attention. The omega-3 in question is EPA (eicosapentaenoic acid). In mouse models and human brain cell trials, EPA was associated with reduced repair capacity in the brain’s blood vessels and a buildup of tau protein — a hallmark of Alzheimer’s disease. DHA, the other major omega-3 in fish oil, did not show the same effect. But it’s not quite as bad as it sounds, as this only applies to brains recovering from repeated mild traumatic injuries — the kind of scenario relevant to contact-sport athletes, military veterans, or people with a history of recurrent falls. This was not a study about the general population, and it doesn't overturn the broader evidence behind omega-3s. The bottom line: for most people, omega-3 supplementation remains well supported. The exception is if you have a history of repeated head injuries; it’s worth asking your doctor whether your supplement is EPA-heavy. If you’d rather get your omega-3s from food, fatty fish two to three times a week alongside walnuts, flaxseeds, and a Mediterranean-style diet is a solid path. GET THE FULL STORY Want to learn more about food, diets, cooking, or some other nutrition subject? Let us know at nutritionedition@healthline.com and we’ll look into it for you! (Heads up, we may use your response in an upcoming newsletter.) RECIPE PICK Slow Cooker Green Chile Chicken and Lime Cauliflower Rice The magic happens in the last 10 minutes with this delicious shredded chicken satisfier. GET THE RECIPE → YES, CHEF Chicken Sausage and Black Bean Skillet This meat-based dish is high in protein and fiber while being low in saturated fat. It includes both chicken sausage and chicken, which — in addition to the black beans and other vegetables — can help keep you satiated. This meat-based dish is high in protein and fiber while being low in saturated fat. It includes both chicken sausage and chicken, which — in addition to the black beans and other vegetables — can help keep you satiated.   START COOKING the takeout What we’re digesting 🌡️ 11 natural ways to reduce symptoms of menopause. Diet, exercise, and a few targeted supplements that actually have evidence behind them. 👁️ Eccentric viewing for wet AMD. A simple technique that trains your peripheral vision to work around central blind spots. 👃 Parkinson’s and smell: what's the connection? Loss of smell can appear years before motor symptoms do. 🩸 How to reverse prediabetes naturally. Eight lifestyle changes that can bring your blood sugar back to a healthy range. Until next time, Take care of yourself, and we’ll see you again soon!   This edition was powered by reading the fine print.️

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