Herb & supplement monograph

Beta-glucans Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Beta-glucans interacts with medications. The heart of this page is the interaction list — every drug Beta-glucans is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Beta-glucans is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Reviewed by licensed pharmacists Sourced from Natural Medicines

On this page

Beta-glucans Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Beta-glucans drug interaction appears low for most people. None of the listed interactions are rated major, and every one rests on theoretical or limited evidence rather than confirmed problems in people.

Interactions deserving the most attention

Two groups of medicines deserve the most care. Beta-glucans may lower blood pressure a little in some people, so combining them with blood pressure medications could, in theory, drop pressure further than intended. There is also some research suggesting beta-glucans can stimulate the immune system, which could work against immunosuppressants, the closely monitored medicines used after transplants and for autoimmune conditions. Neither effect has been proven to cause real harm, but these are the situations where we would watch most closely.

What the rest of the list means

Although the list of interacting medications looks long, it really reflects just two broad concerns applied across many individual drugs. Both are theoretical, based on how beta-glucans might affect blood pressure or immune activity, and neither has been shown to cause meaningful problems when the combinations are actually used.

Check your medications against Beta-glucans

Based on HelloPharmacist’s Beta-glucans interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Beta-glucans

293 medications have a known interaction with Beta-glucans, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Beta-glucans using our pharmacist-reviewed interaction data.

AI summaries are generated from our Beta-glucans interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Beta-glucans combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Beta-glucans affects

Every type of medication (drug category) Beta-glucans is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 2 drug categories Beta-glucans interacts with

Antihypertensive DrugsImmunosuppressants

Antihypertensive Drugs

Theoretically, taking beta-glucans with antihypertensive drugs might increase the risk of hypotension.
Clinical research shows that taking beta-glucans may reduce systolic and diastolic blood pressure in some hypertensive individuals.

Likelihood Possible Evidence D

Immunosuppressants

Theoretically, beta-glucans might interfere with immunosuppressive therapy.
Some clinical research shows that beta-glucans have immunostimulant effects.

Likelihood Possible Evidence D

Monograph

Beta-glucans: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Beta-glucans are natural fibers found in oats, barley, mushrooms, and yeast. The strongest evidence supports the oat and barley types for modestly lowering cholesterol and blood sugar, while immune-related claims from yeast and mushroom sources are far less proven. They are generally well tolerated, but check with your pharmacist before starting any supplement.

Part used: Cell walls of yeast, mushrooms, oats, and barley
Common forms: Capsules, tablets, powders, oat or barley foods, topical creams

People commonly use it for

High cholesterol
Heart health
Immune support
Blood sugar control
Wound care (topical)

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallLikely safe

Beta-glucans from food sources are generally well tolerated by most people.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Beta-glucans are a type of soluble fiber made of sugar molecules linked together. They are found naturally in the cell walls of certain plants, fungi, and microbes. The most common sources are oats and barley, baker's and brewer's yeast, and several mushrooms (such as maitake, shiitake, and reishi).

Not all beta-glucans are the same. The structure differs depending on the source, and this affects how they behave in the body. Oat and barley beta-glucans are best known for heart and blood sugar benefits, while yeast and mushroom beta-glucans are more often marketed for the immune system.

People take beta-glucans as capsules, powders, and tablets, or simply by eating more oats and barley. Some products are also used on the skin to help with wound care or moisturizing.

How it works

For cholesterol and blood sugar, oat and barley beta-glucans work mainly because they are a thick, gel-forming soluble fiber. In the gut, they form a viscous gel that traps cholesterol and bile acids and slows how quickly sugars are absorbed. The body then uses more cholesterol to make new bile acids, which can lower blood cholesterol levels.

For the immune system, yeast and mushroom beta-glucans are thought to act differently. Laboratory studies suggest they can bind to receptors on certain immune cells and trigger immune activity. Most of this research is from cells and animals, and it is not clear how strongly these effects translate to real-world health benefits in people.

Effectiveness

Does Beta-glucans work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 30 uses evaluated

2 Likely effective 28 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Likely Effective Coronary heart disease (CHD)