Evidence supporting the use of: Fish oil
For the health condition: Circulation (to the brain)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Fish oil, rich in omega-3 fatty acids such as EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), has been studied for its effects on circulation, including to the brain. Scientific evidence suggests that omega-3 fatty acids can improve endothelial function, reduce inflammation, and decrease blood viscosity, all of which may support better blood flow. Several clinical trials and meta-analyses have found that regular consumption of fish oil can lower triglyceride levels, reduce blood pressure slightly, and enhance vascular health, potentially supporting cerebral circulation. Some studies have shown improvements in cognitive function in older adults or those with mild cognitive impairment, possibly due to improved cerebral blood flow. However, the evidence is not uniformly strong, as some large randomized controlled trials have shown only modest or no significant effect on cognitive outcomes or stroke prevention.

Overall, while there is a plausible biological mechanism and some positive clinical data, the evidence for fish oil specifically improving brain circulation is moderate. It is widely recommended for general cardiovascular health, which is closely linked to cerebral blood flow, but its direct effect on brain circulation requires more robust, targeted research. Therefore, fish oil's use in this context is supported by scientific evidence, but with moderate strength (rated 3 out of 5).

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