12/05/2026
🧠 Fish oil may not always help the brain recover after injury.
A new study suggests that EPA — one of the main omega-3 fatty acids in fish oil — may interfere with repair after repeated mild traumatic brain injury.
In mouse models, long-term fish oil supplementation was linked to poorer neurological and spatial learning performance over time. The researchers also saw weaker blood vessel repair signals and buildup of tau protein around brain blood vessels — a pattern relevant to chronic traumatic encephalopathy, or CTE.
In lab-grown human brain blood vessel cells, EPA, but not DHA, reduced repair capacity under certain metabolic conditions. The team also found related changes in postmortem brain tissue from people with CTE.
This does not mean fish oil is universally harmful. It suggests omega-3 effects may depend on brain state, injury history, and biology.
📃 RESEARCH PAPER
📌 Karakaya et al., “Eicosapentaenoic acid reprograms cerebrovascular metabolism and impairs repair after brain injury, with relevance to chronic traumatic encephalopathy”, Cell Reports (2026)