How much barley do you need to lower cholesterol?

About 3 g of beta-glucan a day, which is roughly 80 g of barley flakes — a generous bowl. Whole barley, pearl barley and barley-based foods all count. It is the barley food and its fibre that work, not an isolated supplement.

Is barley as good as oats for cholesterol?

They are close twins. Both work through beta-glucan and both carry the same regulator-authorised cholesterol claim at 3 g a day. The barley evidence rests on a smaller trial, and barley also modestly lowers HDL, so treat them as interchangeable whole-grain options rather than one clearly beating the other.

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Does barley lower cholesterol?

Q: Does barley lower cholesterol?

Yes. Barley's soluble fibre, beta-glucan, lowers LDL and total cholesterol — the same mechanism as oats. In a controlled crossover trial, 80 g of barley flakes a day lowered LDL by about 6.5% and total cholesterol by about 4.8%, while a control group's cholesterol rose. The effect is recognised by the FDA, EFSA and Health Canada, which authorise a cholesterol claim for at least 3 g of barley or oat beta-glucan a day. It is a modest, reliable effect, not a dramatic one.

Verdict — Strong for LDL

Reviewed against the AntiAgingGreens evidence standard · Controlled crossover trial + regulator-authorised claim · Last reviewed July 2026

Yes — about 80 g of barley flakes a day lowered LDL cholesterol by roughly 6.5% in a controlled trial, through the same soluble fibre that makes oats work. It's a modest, reliable effect, and it's recognised by food regulators.

You eat

~80 g barley flakes (~3 g beta-glucan), daily

In the gut

Beta-glucan forms a thick, viscous gel

The gel

Traps bile acids and carries them out

Result

Liver pulls cholesterol from blood — LDL ~6.5% lower

Barley and oats share the active ingredient: beta-glucan, a gel-forming fibre that removes bile acids so the liver draws cholesterol out of the blood to replace them.

What the evidence supports

✓ Lower LDL (~6.5%) and total cholesterol (~4.8%) in a controlled trial¹
✓ Regulator-recognised — FDA, EFSA and Health Canada authorise the beta-glucan claim
✓ It's the barley food and its fibre — not a supplement

What it doesn't do

✗ Produce a large drop — the effect is modest, like oats
✗ Improve the whole panel — barley also slightly lowers HDL
✗ Replace medication where a clinician says it's needed

Where this comes from

Not supported Emerging Moderate Strong

Why it works: Barley's beta-glucan is a soluble fibre that forms a thick gel in the gut, exactly as oat beta-glucan does. The gel binds bile acids — which are made from cholesterol — and removes them, so the liver pulls cholesterol out of the blood to make more. The active part is the viscous fibre, which is why the effective amount is measured in grams of beta-glucan.
What the human evidence shows: A confirmed controlled crossover trial gave 32 adults 80 g of barley flakes a day against a white-bread control. Barley lowered LDL cholesterol by about 6.5% and total cholesterol by about 4.8% from baseline, while the control group's total cholesterol actually rose.¹ This sits on top of a broad body of trials that led the FDA, EFSA and Health Canada to authorise a cholesterol claim for at least 3 g a day of beta-glucan from barley or oats.
Where the evidence stops: The effect is modest — a few per cent — and the anchor trial is small (32 people, a short crossover), so treat the exact 6.5% as indicative rather than precise. Barley also lowered HDL a little in that study, so it isn't a whole-panel win. And it depends on reaching the dose: roughly 80 g of flakes for 3 g of beta-glucan.

Why the grain, not a fibre capsule: the cholesterol effect comes from eating barley, and the same fibre is in an ordinary bowl — no product to buy. We recommend no supplement or brand. Barley and oats are interchangeable here, so use whichever fits your kitchen.

At a glance

Claim assessedEating barley lowers cholesterol

VerdictStrong for LDL and total cholesterol; modest (~6.5% LDL)

Food & doseBarley / barley flakes, ~80 g/day (~3 g beta-glucan)

PopulationAdults (anchor trial N=32 crossover) + broad regulator evidence base

Evidence typeControlled RCT + FDA/EFSA/Health Canada authorised beta-glucan claim

Last reviewedJuly 2026

Sources

Effect of barley flakes on blood lipids: a randomized controlled crossover trial. Frontiers in Nutrition, 2023. frontiersin.org

Corroborated by barley beta-glucan meta-analyses (AbuMweis 2010; Ho 2016) and the FDA, EFSA and Health Canada authorised cholesterol claims for beta-glucan.

Bottom line for you

Barley is oats' equal for cholesterol: a daily bowl — around 80 g of flakes, or pearl barley worked into soups and salads — supplies the beta-glucan that lowers LDL by a few per cent. It's one of the better-evidenced food levers, and it carries the same regulator-backed claim as oats.

Keep it in proportion. The drop is modest, the anchor trial is small, and barley nudges HDL down slightly too — so it's a solid whole-grain habit alongside the other levers, not a stand-in for medication.

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