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Dietary supplement

Brewer's Yeast Ingredients & Drug Interactions

by tnvitamins

Brewer's Yeast label
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Tablet Or Pill Category: Other Combinations
Most serious interaction: Major
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Brewer's Yeast against your medications. The heart of this page is the interaction checker and the full interaction report — how this product’s ingredients may interact with prescription and over-the-counter medicines you may be taking.

Around that, we add a pharmacist’s high-level view of the product as a whole — what’s inside, the evidence for its stated use, how transparent the label is, and what safety data exists — so you can see the full picture in one place. It’s educational information from our licensed clinical databases and the clinical staff at HelloPharmacist — not medical advice — and we don’t sell or endorse products. Our editorial policy

The interaction bottom line Most serious interaction: Major

Brewer's Yeast is a dietary supplement by tnvitamins with 1 active ingredient. Its ingredients are commonly taken for source of b vitamins, diarrhea (certain types), cold and flu support.Based on those ingredients, 136 medications have a known interaction with it, the most serious rated major. The ingredients most likely to interact are Brewer's Yeast. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against Brewer's Yeast by tnvitamins

Ask about any prescription or over-the-counter medication and we check it for interactions with Brewer's Yeast by tnvitamins — and tell you which ingredient is responsible.

Pharmacist-reviewed data Checks every ingredient Answer in seconds
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HelloPharmacist Scorecard of Brewer's Yeast by tnvitamins

Our pharmacy team’s full take, with four database checks built into the cards below — a summary of what is known, not a grade of the product itself.

From our pharmacy team — supplement deep dive

Generated from HelloPharmacist’s pharmacist-curated databases and editorial rules · Last generated Jul 16, 2026

What’s inside

Full disclosure
Ingredient Transparency · database check
Full

Every active ingredient lists its own amount on the label.

Why this rating?
  • The label discloses an exact amount for 1 of its 1 active ingredient.
  • No proprietary blends here — you can verify the dose of every single component.

This product contains one active ingredient: brewer's yeast, a type of fungi used as a supplement. Brewer's yeast also contains inactive ingredients including cellulose, stearic acid, vegetable magnesium stearate, croscarmellose, and silica — these are fillers and binders that hold the tablet together.

Does it work?

Moderate evidence
Evidence for Intended Use · database check
By FDA rules, dietary supplements can’t claim to treat, cure, or prevent disease — so labels speak in careful marketing language. We discern each product’s intended use from its name, label claims, and label statements, then grade the clinical evidence for that use. How these ratings are computed

This product doesn't appear to be marketed for a specific use, so we graded Brewer's Yeast's overall clinical evidence instead.

Moderate

Some clinical evidence supports Brewer's Yeast for:

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.
  • Since the label doesn't commit to one use, we graded the ingredient's overall clinical evidence instead.
  • On file: Irritable bowel syndrome (IBS) — rated "Possibly Effective" (Natural Medicines).

The evidence is mixed. Brewer's yeast is possibly effective for irritable bowel syndrome (IBS), meaning some research supports its use but the proof isn't rock solid yet.

For other conditions — Clostridioides difficile infection, influenza, high cholesterol, and hay fever — the evidence we have isn't reliable enough to know whether it works. If you're considering this for any of those uses, talk with your doctor about whether the research is strong enough for your situation.

The evidence, ingredient by ingredient Brewer's Yeast

How safe is it?

Well-documented data
Safety Information · database check
Well characterized

Adverse-effect, pregnancy, and general safety data are on file for most of these ingredients.

Why this rating?
  • We hold adverse-effect (side-effect) data for 1 of the 1 matched ingredient.
  • Pregnancy & breastfeeding safety ratings cover 1 of 1.
  • General safety write-ups exist for 1 of 1.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Brewer's yeast is generally well tolerated in food amounts, but concentrated supplements carry some caution. The most common side effects are gas and migraines.

Rarely, some people have reported intestinal discomfort, anal irritation, or abdominal pain. There's also a theoretical concern about fungemia (yeast in the bloodstream) and anaphylaxis in very sensitive individuals, though these are uncommon.

It may not be safe for people with weakened immune systems or certain conditions, so check with your doctor first if that applies to you. The safety of supplement doses during pregnancy and breastfeeding hasn't been well studied — food amounts are likely fine, but concentrated supplements warrant a conversation with your provider.

Side effects, ingredient by ingredient Brewer's Yeast

Meds to double-check

Major interaction found
Known Interaction Concern · database check
Major identified

At least one ingredient has a documented Major-severity interaction. Check your medications for a personalized result.

Why this rating?
  • 1 of the 1 matched ingredient can interact with medications — Brewer's Yeast.
  • The most serious interaction on file is rated Major.
  • Some involve high-stakes drug classes: diabetes medications; lithium.
  • For scale: 136 individual medications appear in the full list. A big number alone doesn't make a product dangerous — what matters is whether YOUR medication is on it, so run yours through the interaction checker on this page.

Check with your doctor or pharmacist before taking this product if you're on a monoamine oxidase inhibitor (MAOI), an antidiabetes drug, lithium, or an antifungal medication. The first two carry the most serious risks — blood pressure spikes with MAOIs and low blood sugar with diabetes drugs.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFully disclosed formula with some supporting evidence behind its ingredients' uses. Major medication interactions have been identified, and safety information is well characterized.

Brewer's yeast might be worth considering if you have IBS and want to try a food-based option, but it's not a fit if you take MAOIs, diabetes medications, lithium, or antifungals without checking first. If you fall into any of those groups, or if you have a weakened immune system, talk with your doctor or pharmacist before starting this product.

The same goes if you're pregnant or breastfeeding — there's not enough data to be sure.

Educational only — not medical advice; always confirm with your pharmacist. Our editorial policy · How we use AI

Assessment coverage: 1 of 1 active ingredient matched to our full ingredient reviews (monographs). Based on the product label dated Apr 23, 2020.

This Scorecard evaluates available label information, ingredient evidence, and known medication-safety considerations. It does not independently verify product identity, purity, potency, contamination, or manufacturing quality. How these ratings are computed

At a glance

General information

Key facts about Brewer's Yeast, straight from the product label.

Brand tnvitamins
Barcode (UPC) 095234107458
Net contents 500 Tablet(s)
Market status On market
Date entered into DSLD Apr 23, 2020
DSLD ID 217678
Product type Other Combinations
Supplement form Tablet Or Pill
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years), Dairy Free
From the label
Everything in this section is reproduced from the manufacturer’s own product label — it’s the label speaking, not HelloPharmacist. We show it so you can see exactly what the maker states; we don’t verify or endorse those statements.

Supplement Facts

The label details for Brewer's Yeast by tnvitamins, sourced from the NIH Dietary Supplement Label Database.

Supplement Facts

Daily Value (DV) Target Group(s):
Adults and children 4 or more years of age
Minimum serving Sizes:
2 Tablet(s)
Maximum serving Sizes:
2 Tablet(s)
Servings per container
250
UPC/BARCODE
095234107458
IngredientAmount% DV
Brewer's Yeast1000 mg--

Other ingredients: Cellulose, Stearic Acid, Vegetable Magnesium Stearate, Croscarmellose, Silica

Tap any ingredient to jump to its full detail below.

Label statements
These statements are the manufacturer’s wording, reproduced from the product label — the label is saying it, not HelloPharmacist. We don’t verify or endorse them.
Formula

Natural brewer's yeast 7 1/2 grains

FDA Statement of Identity

Dietary Supplement

Formulation

Free of: Wheat, milk, lactose, soy, artificial color, artificial flavor, artificial sweetener, preservatives. Non-GMO

Suggested/Recommended/Usage/Directions

Directions: For adults, take two (2) tablets, three (3) times daily, preferably with meals, or as directed by a health care professional.

FDA Disclaimer Statement

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Precautions

Caution: Pregnant or lactating women should consult a doctor before use.

If you are under medical supervision, please consult a doctor before use. Discontinue use and consult a doctor if any adverse reactions occur.

Keep out of reach of children.

General Statements

Reorder tnvitamins.com 800-645-4446

Is this label outdated? Report a formula or label change and our pharmacy team will review it.

See for yourself

Brewer's Yeast by tnvitamins label

The label scan from the NIH Dietary Supplement Label Database. Tap to enlarge.

Brewer's Yeast label

Label images are published by the NIH Dietary Supplement Label Database for the version of this product on file. Always read your actual product label.

View the full label (PDF)
What’s inside

The Ingredients in Brewer's Yeast by tnvitamins

This is the 1 active ingredient this product is made of. Select it to open its full monograph.

Serving size2 Tablet(s) Dosage formTablet Or Pill Servings per container250 Amounts shown are per serving.

Brewer's Yeast

Interacts with
136 drugs
1000 mg per serving Form: Niacin, Riboflavin, Thiamine

Brewer's yeast is a nutrient-rich fungus that provides B vitamins, protein, and minerals, and a related yeast product (S. boulardii) is used for some...

Brewer's Yeast monograph & interactions

Other (inactive) ingredients: Cellulose, Stearic Acid, Vegetable Magnesium Stearate, Croscarmellose, Silica. These complete the product’s ingredient list but are not active constituents.

Interaction report

Brewer's Yeast by tnvitamins Drug Interactions

Want to check YOUR meds against Brewer's Yeast?

Ask about interactions with your drugs in plain English — “Can I take it with lisinopril?” — and we find you the answer in seconds, ingredient by ingredient.

 Go to the checker
136Drugs
9 Major 87 Moderate 40 Minor

Ingredients driving the most interactions

Brewer's Yeast 136

Individual Drug Interactions

The ingredients in Brewer's Yeast interact with 136 drugs. Click any drug to see the details.

1 of the 1 ingredient in Brewer's Yeast interact with drugs. Each result below shows which ingredient is responsible. Brewer's Yeast

Each ingredient & the kinds of drugs it affects

For each ingredient in Brewer's Yeast with known interactions, here are the types of medications it can affect. Open any type for the detail — or search your exact drug in the checker above.

Brewer's Yeast4 drug types · 136 drugs

Monoamine Oxidase Inhibitors (Maois)

Theoretically, taking brewer's yeast with MAOIs might increase the risk of hypertension.
Brewer's yeast contains tyramine. Taking brewer's yeast with MAOIs might increase the risk for hypertensive crisis.

Likelihood Likely Evidence D
Antidiabetes Drugs

Taking brewer's yeast with antidiabetes drugs might increase the risk of hypoglycemia.
Clinical research shows that taking chromium-containing brewer's yeast can decrease levels of blood glucose in diabetic patients being treated with antidiabetes drugs.

Likelihood Possible Evidence B
Lithium

Theoretically, taking brewer's yeast with lithium might cause additive effects and side effects.
Some brewer's yeast products contains lithium.

Likelihood Possible Evidence D
Antifungals

Theoretically, taking antifungals with some brewer's yeast products might decrease the effectiveness of brewer's yeast.
Some brewer's yeast products contain live yeast. Therefore, simultaneously taking antifungals might kill a significant number of the organisms.

Likelihood Possible Evidence D
Brewer's Yeast full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Brewer's Yeast, from the product label.

tnvitamins

See all tnvitamins products
Name
TOTAL NUTRITION, INC.
City
FARMINGDALE
State
NY
ZipCode
11735
Phone Number
800-645-4446
Web Address
tnvitamins.com
Pharmacist Counseling Corner

Brewer's Yeast by tnvitamins: Common Questions

Does Brewer's Yeast by tnvitamins interact with any medications?
Yes. Based on its ingredients, Brewer's Yeast has a known interaction with 136 medications, including 9 rated major. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
Brewer's Yeast contains a single active ingredient, and that one ingredient can interact with many different medications on its own. We check it against each medication and show the mechanism responsible.
Where does this information come from?
The product label data comes from the NIH Dietary Supplement Label Database (DSLD); the interaction data is built on the Natural Medicines database and reviewed by HelloPharmacist pharmacists.
What is brewer's yeast and where does it come from?
Brewer's yeast is a type of fungi that's a byproduct of beer brewing. It's been used as a food and supplement for its nutrient content, and it contains compounds like chromium and tyramine that can affect your body and interact with medications.
Can I take brewer's yeast if I have diabetes?
Check with your doctor first. Research shows brewer's yeast can lower blood sugar, which is helpful for some people but risky if you're already on diabetes medication — you could end up with dangerously low blood sugar. Your doctor can advise whether it's safe for you.
What side effects should I expect?
The most common side effects are gas and migraines. Some people also report intestinal discomfort, abdominal pain, or anal irritation. Serious side effects like anaphylaxis are rare but possible in sensitive individuals.
Is brewer's yeast safe during pregnancy?
Food amounts are likely fine, but the safety of concentrated supplements during pregnancy hasn't been well studied. Talk with your doctor or pharmacist about whether it's right for you and your pregnancy.
Does brewer's yeast actually work for IBS?
The evidence suggests it's possibly effective for IBS, meaning some research supports its use but it's not proven. For other conditions like the flu or high cholesterol, the evidence isn't strong enough to say whether it helps.
Can I take this if I have a weak immune system?
Brewer's yeast may not be safe for people with weakened immune systems or certain conditions. Check with your doctor before starting, especially if you have any immune-related health issues.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Not sure if Brewer's Yeast is safe with your meds?

Our pharmacists answer your medication & supplement questions — free.

Ask a pharmacist

Label information is sourced from the NIH Dietary Supplement Label Database and reflects the product version on file; always read your actual product label. This page is for education only and is not a substitute for professional medical advice. Confirm with your pharmacist or doctor before combining supplements and medications.

Brewer's Yeast label
Go deeper

The Full Monographs Behind Brewer's Yeast’s Ingredients

Every ingredient we hold a full HelloPharmacist monograph for — uses, evidence, safety, and the complete interaction list.

Herb & supplement monograph

Brewer's Yeast

Interacts with 136 drugs

Brewer's yeast is a nutrient-rich fungus that provides B vitamins, protein, and minerals, and a related yeast product (S. boulardii) is used for some types of diarrhea. Most other health cla...

Read the full Brewer's Yeast monograph →
Sources

Sources & How We Checked

Brewer's Yeast's label data comes from the NIH Dietary Supplement Label Database; the ingredient interaction data is from the Natural Medicines database, reviewed by our pharmacists.

Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.

The 6 references behind this product’s interaction data

Every citation that drives the interaction findings for this product’s ingredients, from the evidence-graded Natural Medicines (TRC Healthcare) database. Open an ingredient to browse its citations — links open the study on PubMed or the publisher’s site.

Brewer's Yeast 6 references
  1. Blumenthal M, ed. The Complete German Commission E Monographs: Therapeutic Guide to Herbal Medicines. Trans. S. Klein. Boston, MA: American Botanical Council, 1998.
  2. Lewis SJ, Freedman AR. Review article: the use of biotherapeutic agents in the prevention and treatment of gastrointestinal disease. Aliment Pharmacol Ther 1998;12:807-22. PubMed
  3. Bahijiri, S. M., Mira, S. A., Mufti, A. M., and Ajabnoor, M. A. The effects of inorganic chromium and brewer's yeast supplementation on glucose tolerance, serum lipids and drug dosage in individuals with type 2 diabetes. Saudi.Med.J. 2000;21(9):831-837. DOI
  4. Schrauzer, G. N. and de, Vroey E. Effects of nutritional lithium supplementation on mood. A placebo-controlled study with former drug users. Biol.Trace Elem.Res. 1994;40(1):89-101. PubMed
  5. Gayathri R, Aruna T, Malar S, Shilpa B, Dhanasekar KR. Efficacy of Saccharomyces cerevisiae CNCM I-3856 as an add-on therapy for irritable bowel syndrome. Int J Colorectal Dis. 2020;35(1):139-145. PubMed
  6. Mourey F, Decherf A, Jeanne JF, et al. Saccharomyces cerevisiae I-3856 in irritable bowel syndrome with predominant constipation. World J Gastroenterol 2022;28(22):2509-2522.

See these in context on the Brewer's Yeast monograph →

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

© 2021 Therapeutic Research Center, LLC

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