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

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Synopsis

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

Blueberry (Vaccinium spp.), particularly its fruit and extracts, has received scientific interest for its potential cognitive benefits, including effects on concentration and attention. The justification for its use in supporting poor concentration is based on several small-scale human studies and animal research suggesting that blueberries' high content of flavonoids, especially anthocyanins, may have neuroprotective and cognitive-enhancing properties. These compounds are thought to improve neuronal signaling and reduce oxidative stress and inflammation, which can impact cognitive function.

Several randomized controlled trials in both children and older adults have explored blueberry supplementation and cognitive outcomes. Some studies have reported modest improvements in measures of attention and memory after short-term consumption of blueberry juice or extracts. For example, a 2017 study in children found that a single serving of a blueberry-containing drink led to improved performance on tasks requiring sustained attention. In older adults, similar interventions have sometimes led to small but statistically significant improvements in executive function and working memory.

However, the overall evidence remains limited, with sample sizes generally small and differences in formulations and dosages. There are also studies with null results. As a result, while there is preliminary scientific support for blueberries in addressing poor concentration, the strength of evidence is moderate at best and does not yet warrant strong clinical recommendations.

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