In the United States, fish oil and Omega-3 supplements have gained immense popularity, often marketed for their potential benefits to heart and brain health. However, recent research from the Medical University of South Carolina suggests that these supplements may actually hinder the brain’s healing processes following an injury.
This study joins a growing number of investigations that challenge the purported health benefits of fish oil, with some findings indicating that these supplements might do more harm than good.
Millions of individuals incorporate fish oil or similar Omega-3 products into their daily routines. A 2025 survey revealed that nearly half of supplement users included fish oil, making it the third-most consumed dietary supplement. Additionally, a separate study indicated that one in five adults aged 60 and older take fish oil, believing it benefits their heart, brain, or overall health. However, many supplement manufacturers make these claims with little scientific backing.
The marketing of these supplements often leverages the well-established link between consumption of omega-3-rich fish and a lower risk of heart disease. This group includes various fish such as anchovies, salmon, and tuna. The assumption is that taking supplements containing these Omega-3 components will confer similar benefits. However, these assertions are now facing increased skepticism.
The recent MUSC study concentrated on the brain health claims surrounding Omega-3 supplements. The two predominant Omega-3 fatty acids found in these products are typically referred to as EPA and DHA. These critical fats cannot be produced by the body and must be ingested through diet, explained Dr. Onder Albayram, the study’s lead author and an associate professor in the Departments of Pathology and Laboratory Medicine, and Neuroscience.
Dr. Albayram emphasized, “You must consume it.” Omega-3 fatty acids have long been advertised as neuroprotective, supporting brain health. However, prolonged intake may result in their accumulation in various body areas, a phenomenon that Albayram and his team observed in a mouse model.
They discovered that the brain doesn’t typically metabolize these fatty acids, leading to their retention. When researchers induced mild traumatic brain injuries in the mice, akin to concussions, the accumulated EPA fatty acids were mobilized during the brain’s repair attempts. Contrary to expectations, this mobilization appeared to obstruct the formation of new blood vessels vital for delivering oxygen and nutrients to the damaged regions, said Albayram. It also disrupted the normal functioning of the cells that line blood vessels, resulting in structural abnormalities that potentially led to cognitive decline.
The ailments mirrored those seen in chronic traumatic encephalopathy (CTE), a significant concern for former football players and others who have endured repetitive head trauma. Collaborators from the Boston University Alzheimer’s and CTE Center, which houses donated human brains from ex-NFL players, noted that the similarities in the brain samples were striking, Albayram reported.
While Omega-3 fatty acids may offer other health advantages, the study underscores the need for “more precise and context-aware nutritional strategies for brain health,” according to Albayram.
This research adds to a growing body of evidence critiquing Omega-3 supplements. Even while acknowledging potential benefits in reducing some heart disease risks, some cardiologists warn that these must be weighed against an increased risk of other serious heart conditions, like atrial fibrillation or irregular heartbeats.
A study published in the British Medical Journal revealed that the benefits and risks associated with regular fish oil usage varied significantly based on context. For individuals with heart disease, these supplements reduced the risk of worsening conditions, while in healthy individuals, they increased both the risk of atrial fibrillation and a slight rise in stroke risk.
Ultimately, the effectiveness of these supplements is contingent on the individual’s reasons for taking them and the intended benefits, Albayram concluded. “The biology may be more complex than we had previously understood,” he added.
