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Strong evidenceHeart & metabolic

Barley Beta-Glucan

The soluble fibre from barley, one of the few supplement ingredients with an authorised cholesterol-lowering health claim. Dozens of randomized trials and several independent meta-analyses agree it lowers LDL cholesterol, by a modest but real amount.

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What the science says

  • LDL cholesterol lowering Strong evidence

    A systematic review and meta-analysis of randomized controlled trials found barley beta-glucan reduced LDL cholesterol, non-HDL cholesterol and apolipoprotein B, pooling data from dozens of trials. The effect is consistent across studies and dose-dependent.

  • Regulatory recognition Strong evidence

    The EFSA panel on dietetic products issued a scientific opinion substantiating a health claim that barley beta-glucans lower blood cholesterol and reduce coronary heart disease risk, at 3 g per day. Both EFSA and the FDA have accepted this claim based on the trial evidence.

  • Blood glucose Moderate evidence

    A meta-analysis of beta-glucan intake reported reductions in blood glucose alongside cholesterol, attributed to slowed gastric emptying and carbohydrate absorption. Glycaemic effects are smaller and less consistent than the lipid effects.

Dosage & safety

Studied doseAt least 3 g per day of barley beta-glucan is the dose behind the approved cholesterol claim, taken with meals. That equals roughly 60–80 g of dry pearl barley or a corresponding fibre supplement.
SafetyVery safe as a food fibre. Bloating, gas and loose stools are common when starting; increase gradually and drink water. Barley contains gluten, so it must be avoided by anyone with coeliac disease. It can slow absorption of some medications, so separate doses by a couple of hours, and people on diabetes medication should watch for lower glucose.

How to take it

TimingWith meals, split across two or three eating occasions rather than in one dose.
With food?With food — it works by thickening the meal it is eaten with, so a dose away from food does nothing for cholesterol.
Worth knowingBarley contains gluten, so this specific fibre is off the table in coeliac disease; oat beta-glucan does the same job at the same dose.

Interactions

With medications

  • any oral medication

    Viscous fibre slows gastric emptying and can reduce how much drug is absorbed. separate by about 2 hours

  • insulin and other diabetes medication

    Beta-glucan flattens the post-meal glucose rise, adding to the drug's effect. monitor your glucose when you start

With other supplements

  • iron, zinc and other mineral supplements

    Viscous fibre reduces mineral absorption when taken in the same meal. take minerals at a different time of day

Well-established interactions only — this is not a complete list. Always tell your doctor and pharmacist what you take.

Frequently asked questions

Does barley beta-glucan lower cholesterol?

Yes, barley beta-glucan has strong evidence: meta-analyses of dozens of randomized trials show it lowers LDL cholesterol, non-HDL cholesterol and apolipoprotein B by a modest but real amount. EFSA and the FDA both accept a health claim for barley beta-glucan and cholesterol.

How much barley beta-glucan per day to lower cholesterol?

At least 3 g per day of barley beta-glucan is the dose behind the approved cholesterol claim, roughly 60–80 g of dry pearl barley or a corresponding fibre supplement. Split it across two or three meals.

Should barley beta-glucan be taken with food?

Barley beta-glucan must be taken with food, because it works by thickening the meal it is eaten with; a dose away from food does nothing for cholesterol. Separate it from oral medications and mineral supplements by about 2 hours.

Is barley beta-glucan safe for coeliac disease?

No, barley contains gluten, so barley beta-glucan must be avoided by anyone with coeliac disease; oat beta-glucan does the same job at the same dose. Otherwise barley beta-glucan is very safe, though bloating and gas are common when starting.

Scientific references

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