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Blueberry

Blueberry

What the trials found

Blueberry supplements do not yet have a clear overall health benefit, with human evidence strongest only for short-term changes in antioxidant or oxidative-stress markers.

Median effective dose, most-studied outcomes

  • Support overall antioxidant capacity 200 g <1 wk
Full protocol, 1 outcomes

Risk, worst reported severity

  • aspiration during gavage leading to early euthanasia severe
  • leukocytosis mild
  • triazolam minor
  • buspirone minor
All 12 events and interactions
Protocol

Dose, timing & forms

How much

The clearest dose signal comes from a short study using 200 g of blueberry as a food-level serving, where researchers assessed antioxidant-capacity markers. 1 That is useful as a real-world benchmark, but it does not justify treating blueberry as a high-dose antioxidant therapy or assuming the same result from every capsule or extract. 1

When and how long

Research does not identify a best morning, evening, or workout-specific time for blueberry intake. The short protocol used oral blueberry intake over several days, so consistency fits the evidence better than occasional use when you feel run-down. 1 Take a food-based product with a meal if that feels better on your stomach, but this has not been tested as a performance advantage. 1

Forms & standardisation

The human trial used a wild blueberry drink, not a highly concentrated capsule, so beverage and whole-food forms currently sit closer to the evidence than proprietary extracts. 1 If you choose an extract, look for clear disclosure of the blueberry species and anthocyanin content, rather than relying on a vague “berry blend” label. Evidence has not established a specific anthocyanin standard that predicts results. 1

Studied range, by outcome

Outcome Studied range Median effective Duration Evidence
Support overall antioxidant capacity — 200 g <1 wk 1 paper 1 sig. endpoint

Adverse events and drug interactions

Safety events

aspiration during gavage leading to early euthanasia severe
leukocytosis mild
eosinophilia mild
neutrophilia mild
lymphopenia mild
body weight decreased mild
thymus atrophy mild
increased intestinal permeability mild

Drug interactions

triazolam minor unknown
buspirone minor unknown
flurbiprofen minor unknown
etanercept minor decreases effect
In context

What this is and how it works

  • One human study examined a wild blueberry drink’s short-term oxidative-stress markers in healthy subjects, without a reported effect estimate. 1
  • Thirty-nine papers reviewed here span 103 outcomes, making the overall blueberry-supplement picture broad but uneven.
  • Evidence centers on short-term biomarker changes rather than proven improvements in symptoms, disease risk, or long-term health.

Blueberries are small berries from Vaccinium species, valued for their deep blue-purple pigments. Those pigments include anthocyanins, plant compounds that give blueberries their color and make them a common ingredient in powders, juices, and extracts.

Anthocyanins interact with the body's antioxidant defense network, which works like a cleanup crew that neutralizes unstable molecules before they bump into and damage cell parts. A short trial of a wild blueberry drink found changes in oxidative-stress markers in healthy adults, though that result does not prove broad health benefits. 1

Bottom line

Blueberry makes the most sense for someone who wants a nutrient-rich food or drink and likes the idea of adding anthocyanin-rich plants to their routine. The reviewed human evidence for antioxidant capacity is short-term and limited, so keep expectations modest. 1 Skip expensive extracts that hide their anthocyanin content or promise dramatic results.

Frequently asked

Common questions

Do blueberries work as an antioxidant supplement?

A short human study found that a wild blueberry drink supported markers of antioxidant status, but one brief study cannot establish a broad, noticeable health effect. 1

Is blueberry extract better than eating blueberries?

The available evidence does not establish that extracts outperform whole blueberries. Whole-food blueberry preparations also provide fiber and a naturally mixed set of plant compounds, while extract labels vary widely. 1

When should you take a blueberry supplement?

No human evidence establishes a best time of day. Use it consistently if you choose to use it, rather than expecting a single serving to create a lasting change. 1

Sources

Sources

  1. 1. Effect of a wild blueberry drink consumption on markers of oxidative stress in healthy subjects (2012) ↑

Generated August 27, 2026

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