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Fish oil has long been celebrated for its cognitive benefits, but new research complicates that picture. In people with repeated mild head injuries, a key omega-3 fatty acid may actually hinder the brain’s natural repair process.
A new study from the Medical University of South Carolina (MUSC) found that rather than aiding recovery, EPA—one of the primary omega-3 fatty acids found in fish oil—appears to compromise vascular stability, disrupt healing signals, and may even accelerate the protein buildup associated with cognitive decline.
Omega-3 fatty acids have expanded well beyond supplements into drinks, dairy alternatives, and snacks. According to Fortune Business Insightsthis rising demand is helping drive the global unsaturated fatty acid market, which is valued at $13.88 billion in 2025 and projected to reach $24.56 billion by 2034.
“Fish oil supplements are everywhere, and people take them for a range of reasons, often without a clear understanding of their long-term effects,” lead investigator and neuroscientist Onder Albayram, PhD, told MUSC. “But in terms of neuroscience, we still don’t know whether the brain has resilience or resistance to this supplement. That’s why ours is the first such study in the field.”
Albayram and his team uncovered what they call a context-dependent metabolic vulnerability where altered cellular energy patterns appear to undermine the brain’s ability to heal. This weakness seems tied to an accumulation of EPA.
The researchers built a series of models connecting diet, brain function, and healing. By tracking how long-term fish oil consumption shaped the brain’s response to repeated mild head impacts in mice, the team specifically focused on blood vessel stability and repair signals.
To find this, the mice were placed on the diet for one month before undergoing either repetitive mild closed head injuries or a sham procedure. They were then kept on the diet for another six months to assess the long-term effects.
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