How many blueberries do you need for blood pressure?

The trials used about one cup of blueberries a day — roughly 150 g of fresh or frozen berries, or about 26 g of freeze-dried powder. That is the amount that improved vascular function across studies and lowered systolic blood pressure in older adults.

Are fresh, frozen or freeze-dried blueberries best?

All are reasonable — the trials used fresh, frozen and freeze-dried whole berries and the active anthocyanins survive freezing. The whole fruit is what the evidence supports; there is no need for an anthocyanin supplement, and we recommend none.

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Do blueberries lower blood pressure?

Q: Do blueberries lower blood pressure?

Partly. Blueberries reliably improve how well the blood vessels work, and in a confirmed double-blind trial about a cup a day lowered 24-hour systolic blood pressure in healthy older adults. But another trial in people with metabolic syndrome improved vessel function without a blood-pressure change, so the effect on blood pressure itself is not seen in every group. The honest rating is moderate: the vascular benefit is consistent, the blood-pressure fall is best shown in older adults.

Verdict — Moderate

Reviewed against the AntiAgingGreens evidence standard · Double-blind RCT + vascular-function trials · Last reviewed July 2026

Partly — blueberries reliably improve how well your blood vessels work, and about a cup a day lowered systolic blood pressure in healthy older adults. But not every trial has shown a blood-pressure fall, so the honest rating is moderate rather than strong.

You eat

~1 cup blueberries (≈150 g), daily

What's in them

Anthocyanins — the blue-purple pigments

In the body

Better nitric-oxide signalling; vessels widen (flow-mediated dilation improves)

Result

Vessel function improves consistently; systolic BP lower in older adults

The consistent, well-replicated effect is on blood-vessel function. A lower blood-pressure reading is the downstream step — clearly shown in older adults, but not in every trial or group.

What the evidence supports

✓ Improve blood-vessel function (flow-mediated dilation) across trials
✓ Lowered 24-hour systolic BP in healthy older adults¹
✓ A whole-food dose, about a cup a day

Where it's less certain

✗ Not every trial shows a blood-pressure fall — a metabolic-syndrome study found none
✗ The diastolic number is not reliably moved
✗ Not a replacement for medication

Where this comes from

Not supported Emerging Moderate Strong

Why it works: Blueberries are rich in anthocyanins — the pigments that make them blue — which improve nitric-oxide signalling in the lining of the blood vessels. That lets the vessels relax and widen, measured in trials as better flow-mediated dilation. A lower blood-pressure reading can follow from that, but it is a step further down the chain, and it does not appear every time the vascular change does.
What the human evidence shows: The clearest single result is a confirmed double-blind randomised trial in healthy older adults: about a cup a day of blueberries (as freeze-dried powder) improved flow-mediated dilation, lowered 24-hour ambulatory systolic blood pressure, and improved immediate word recall.¹ The vascular-function benefit is well replicated — for example a six-month trial in metabolic syndrome improved blood-vessel function too. But that same line of research is where the caution comes from: a shorter metabolic-syndrome trial improved vessel function with no change in blood pressure. So the vascular effect is consistent; the blood-pressure effect is best evidenced in older adults.
What would move this to strong: A second independent randomised trial showing the same systolic blood-pressure fall — ideally a pooled analysis across blueberry trials that measured blood pressure directly. Until the blood-pressure endpoint replicates as cleanly as the vessel-function one, the honest rating stays moderate.

Why the fruit, not an anthocyanin capsule: the trials used whole blueberries — fresh, frozen or freeze-dried — and the effect is well shown in that form. We recommend no supplement, extract or supplement brand. A cup of blueberries is the evidence; an anthocyanin pill is not the same thing.

At a glance

Claim assessedEating blueberries lowers blood pressure

VerdictModerate — vessel function improves consistently; systolic BP lowered in older adults, not in every trial

Food & doseWhole blueberries, ~1 cup/day (≈150 g fresh, or ~26 g freeze-dried)

PopulationBest BP evidence in healthy older adults; vascular data across groups

Evidence typeDouble-blind RCT (Wood 2023) plus vascular-function trials

Last reviewedJuly 2026

Sources

Wild blueberry (poly)phenols improve vascular function and cognition in healthy older adults: a double-blind randomized controlled trial. American Journal of Clinical Nutrition, 2023. PMC10315404

Vascular-function benefit corroborated by earlier blueberry trials (e.g. Curtis et al., 2019); a shorter metabolic-syndrome trial (Stull et al., 2015) improved vessel function without a blood-pressure change.

Bottom line for you

A cup of blueberries a day is a well-evidenced way to help your blood vessels work better, and in older adults it lowered systolic blood pressure too. Fresh, frozen or freeze-dried all work — it is the whole fruit, not a supplement, that the trials tested.

Be a little measured about the blood-pressure claim specifically: it is clear in older adults but has not shown up in every trial, which is why we rate it moderate rather than strong. Eat blueberries for the vascular benefit and the broader nutrition; treat any blood-pressure improvement as a likely bonus, not a guarantee, and not a substitute for medication.

Educational information based on peer-reviewed human studies. Not medical advice — do not start, stop or change blood-pressure medication without your clinician. AntiAgingGreens never sells or recommends supplements. We report what the evidence shows — and where it stops.