Major interaction on record — check this product against your medications before combining. Based on 1 of 2 ingredients. Check your meds →
Dietary supplement

Brewer's Yeast 1000 mg Ingredients & Drug Interactions

by NusaPure

Brewer's Yeast 1000 mg label
See full label image
Capsule Category: Botanical
Most serious interaction: Major
Clinical methodology reviewed by · Updated Sep 9, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking Brewer's Yeast 1000 mg 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 1000 mg is a dietary supplement by NusaPure with 2 active ingredients. 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 1000 mg by NusaPure

Ask about any prescription or over-the-counter medication and we check it for interactions with Brewer's Yeast 1000 mg by NusaPure — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Brewer's Yeast 1000 mg by NusaPure

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 at 1000 mg per capsule. Brewer's yeast is a byproduct of beer fermentation and has been studied for digestive and metabolic support.

The capsule also contains inactive ingredients — cellulose, rice flour, silica, and magnesium stearate — which help form and stabilize the capsule.

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).

Brewer's yeast is possibly effective for irritable bowel syndrome (IBS). For other uses — including Clostridioides difficile infection, influenza, high cholesterol, and allergic rhinitis (hay fever) — the evidence we hold is insufficient to say whether it works.

If you're considering it for one of those other purposes, talk with your doctor or pharmacist about what the research actually shows.

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 when used short-term and in doses typical of food. The most common side effects are flatulence and migraine-like headaches.

Rare but serious concerns include fungemia (a yeast infection in the bloodstream) and anaphylaxis in people who are sensitive to yeast. It may not be safe for people with weakened immune systems or certain conditions, so check with your doctor if that applies to you.

During pregnancy and breastfeeding, brewer's yeast in food amounts is likely fine, but the safety of concentrated supplement doses isn't well studied. Talk with your provider before taking this supplement if you're pregnant or breastfeeding.

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.

Before taking this product, check with your doctor or pharmacist if you take MAOIs (antidepressants), diabetes medications, lithium, or antifungal drugs. The MAOI interaction is the most serious and can cause a dangerous jump in blood pressure.

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 may help with irritable bowel syndrome, but it interacts with several important medications — especially MAOIs, diabetes drugs, and lithium. You should also be aware of common side effects like gas and headaches.

Check with your doctor or pharmacist before starting, especially if you take any prescription medications, have a weakened immune system, or are pregnant or breastfeeding.

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 Feb 22, 2024.

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 1000 mg, straight from the product label.

Brand NusaPure
Barcode (UPC) X001WMITOF
Net contents 200 Veg Cap(s)
Market status On market
Date entered into DSLD Feb 22, 2024
DSLD ID 307288
Product type Botanical
Supplement form Capsule
Dietary claims / uses All Other, Structure/Function
Intended target group(s) Vegan, Vegetarian, Adult (18 - 50 Years), Gluten Free, 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 1000 mg by NusaPure, 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 Veggie Capsule(s)
Maximum serving Sizes:
2 Veggie Capsule(s)
Servings per container
100
UPC/BARCODE
X001WMITOF
IngredientAmount% DV
Calories0 Calorie(s)--
Total Carbohydrates0.5 Gram(s)1%
Protein0.5 Gram(s)1%
Brewer's Yeast1000 mg--

Other ingredients: Cellulose, Rice Flour, Silica, Magnesium Stearate

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

Brewers Yeast 1000mg per serving

General Statements

New

Suggested/Recommended/Usage/Directions

Directions: For adults, take two (2) capsules daily before a meal. Please, discuss the supplements and medications you take with your health care providers.

Precautions

Warning: For adults only. Not intended for use by persons under the age of 18.

Brewer's yeast has significant amounts of tyramine.

Consult physician if taking an MAO inhibitor or other medication, if pregnant/nursing, or if you have Crohn's Disease, or other medical condition.

Avoid this product if you are allergic to yeast.

Discontinue use and consult your doctor if any adverse reactions occur.

Keep out of reach of children.

Contains wheat. Brewer's yeast is derived from barley and wheat.

Allergen information: Not manufactured with soy, corn, milk, fish, shellfish or tree nut ingredients. Produced in a GMP facility that processes other ingredients containing these allergens.

Formulation

Natural color variation may occur in this product.

GMO Free Made with non-GMO ingredients Gluten Free FDA Registered Facility

Assembled in USA Tested Supports nutritional supplementation Made under strict GMP Guidelines Max strength

Suitable for Vegetarians/Vegans

Allergen information: Not manufactured with soy, corn, milk, fish, shellfish or tree nut ingredients.

Storage

Store in cool dry place. Avoid excessive heat or moisture.

FDA Disclaimer Statement

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

Seals/Symbols

Premium Quality Assembled in USA Gluten Free FDA Registered Facility

Manufactured in a cGMP inspected facility

FDA Statement of Identity

Dietary Supplement

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

See for yourself

Brewer's Yeast 1000 mg by NusaPure label

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

Brewer's Yeast 1000 mg 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 1000 mg by NusaPure

These are the 2 active ingredients this product is made of. Select any to open its full monograph.

Serving size2 Veggie Capsule(s) Dosage formCapsule Servings per container100 Amounts shown are per serving.

Most supplement products combine several ingredients, and a medication can interact with the product through any one of them. Each ingredient below shows whether it has known drug interactions.

Protein

0.5 Gram(s) per serving

Brewer's Yeast

Interacts with
136 drugs
1000 mg per serving

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, Rice Flour, Silica, Magnesium Stearate. These complete the product’s ingredient list but are not active constituents.

Interaction report

Brewer's Yeast 1000 mg by NusaPure Drug Interactions

Want to check YOUR meds against Brewer's Yeast 1000 mg?

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 1000 mg interact with 136 drugs. Click any drug to see the details.

1 of the 2 ingredients in Brewer's Yeast 1000 mg 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 1000 mg 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 1000 mg, from the product label.

NusaPure

See all NusaPure products
Name
Gmax Central, LLC
Street Address
500 Westover Dr. #92909
City
Sanford
State
NC
ZipCode
27330
Pharmacist Counseling Corner

Brewer's Yeast 1000 mg by NusaPure: Common Questions

Does Brewer's Yeast 1000 mg by NusaPure interact with any medications?
Yes. Based on its ingredients, Brewer's Yeast 1000 mg 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 1000 mg contains 2 active ingredients, and an interaction can come from any of them. We check every ingredient, combine the results into one list per medication, and show which ingredient and mechanism is 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.
Can I take brewer's yeast if I'm pregnant or breastfeeding?
Food amounts of brewer's yeast are likely fine during pregnancy and breastfeeding, but the safety of supplement doses hasn't been well studied. Talk with your doctor or pharmacist before taking this product.
What side effects might I get?
The most common are gas and migraine-like headaches. Rare serious effects include yeast infection in the bloodstream and severe allergic reactions. If you have a weakened immune system or certain health conditions, check with your doctor first.
Does brewer's yeast actually work?
It's possibly effective for irritable bowel syndrome. For other uses like influenza, high cholesterol, and hay fever, we don't have enough reliable evidence to say whether it works.
Will brewer's yeast interfere with my diabetes medication?
Yes — brewer's yeast can lower blood sugar, so taking it with diabetes drugs raises the risk of low blood sugar (hypoglycemia). Your doctor or pharmacist needs to know about it before you start.
What's in this capsule besides the yeast?
The inactive ingredients are cellulose, rice flour, silica, and magnesium stearate — these help form and stabilize the capsule. They're not active ingredients.

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

Not sure if Brewer's Yeast 1000 mg 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 1000 mg label
Go deeper

The Full Monographs Behind Brewer's Yeast 1000 mg’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 1000 mg'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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