Conclusion: Daily cranberry juice (240 mL) consumption for 12 weeks and blueberry extract or powder supplementation (9.1 to 9.8 mg of anthocyanins, respectively) for 8 to 12 weeks showed a beneficial effect on glucose control in T2DM subjects. Those results indicate a promising use of these berries in T2DM management; although more studies are required to better understand the mechanisms involved.
PubMed 29345498 ↗Blueberry Extract
Based on 3 first-hand reports and 1 meta-analyses & systematic reviews in the medical literature. Ranked #1558 of 1,974 overall.
Of reports that state an outcome, 0% are positive.
What Blueberry Extract does, according to users
Of the people who reported each effect, the share who said it got better.
What the research says
Systematic reviews and meta-analyses from PubMed, with their published conclusions.
At least one meta-analysis, or 5+ randomized controlled trials. The grade measures how much human research exists — read the conclusions below for what it found.
Dosage people report
As stated by users — not a recommendation. Follow the label or your doctor.
Reported side effects
How often each side effect came up across all reports.
What users say
Verbatim quotes, shortened only — each links to the original discussion.
“Polyphenols esp blueberry extract. Life Extension blueberry extract plus pomegranate extract is good and well priced.”
“Wild Blueberry”
“blueberry extract, PQQ, black seed oil”
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User data from public discussions; research from PubMed. Information only, not medical advice — talk to a doctor before starting, stopping or combining anything. Data updated October 2, 2026. How we rate