Evidence supporting the use of: Blueberry
For the health condition: Concentration (poor)

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Synopsis

Source of validity: Scientific
Rating (out of 5): 2

Blueberry (Vaccinium spp.) is associated with cognitive benefits, including potentially improving concentration, primarily based on scientific research rather than longstanding traditional use. Several studies have investigated the polyphenol content—especially anthocyanins—in blueberries, which are antioxidants thought to have neuroprotective effects. Some clinical trials in both older adults and children have reported improvements in various aspects of cognitive function, such as memory and executive function, after supplementation with blueberry extracts or whole berries. For example, a 2017 randomized controlled trial found that older adults with mild cognitive impairment showed improved brain activation and modest improvement in working memory after consuming blueberry powder for 16 weeks. Another study in children showed enhanced executive function following acute blueberry supplementation.

However, while these findings are promising, the evidence is still considered preliminary, and most studies are small and of short duration. There is not yet strong, consistent evidence that blueberry supplementation specifically and reliably improves concentration in the general population. The mechanisms are still under investigation, but may involve improved blood flow to the brain and reduced oxidative stress. Thus, while blueberries have some scientific support for cognitive enhancement, the strength of evidence specifically for treating poor concentration is limited, meriting a moderate-low rating.

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