Major interaction on record — check this product against your medications before combining. Based on 1 of 3 ingredients. Check your meds →
Dietary supplement

Nutritional Yeast Ingredients & Drug Interactions

by Dr. Berg

Nutritional Yeast label
See full label image
Tablet Or Pill Category: Botanical With Nutrients
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 Nutritional 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

Nutritional Yeast is a dietary supplement by Dr. Berg with 3 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 Nutritional 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 Nutritional Yeast by Dr. Berg

Ask about any prescription or over-the-counter medication and we check it for interactions with Nutritional Yeast by Dr. Berg — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of Nutritional Yeast by Dr. Berg

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 11, 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 2 of its 2 active ingredients.
  • No proprietary blends here — you can verify the dose of every single component.

Dr. Berg's Nutritional Yeast contains two active ingredients.

The main one is nutritional yeast (also called brewer's yeast), a deactivated form of yeast used as a food supplement. The product also includes Vitamin B1, though we don't hold detailed data on that ingredient.

The tablet also contains several inactive ingredients — microcrystalline cellulose, dicalcium phosphate, vanilla flavor, silicon dioxide, magnesium stearate, and stevia — which are fillers and binders that help hold the pill 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 for nutritional yeast is mixed. For irritable bowel syndrome (IBS), research suggests it's possibly effective.

For other conditions on the label — clostridioides difficile infection, influenza, high cholesterol (hypercholesterolemia), and hay fever (allergic rhinitis) — we don't have enough reliable evidence to rate whether it works. If you're considering this product for one of those other uses, talk with your pharmacist or doctor about what the current research actually supports.

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.

Nutritional yeast is generally well tolerated when eaten in food amounts, but as a concentrated supplement, safety data in pregnancy and breastfeeding isn't well studied — check with your provider before using it if you're pregnant or nursing. The most common side effects are gas (flatulence) and migraine-like headaches.

Some people may experience abdominal pain, anal irritation, or intestinal discomfort. Rarely, it may cause anaphylaxis in sensitive individuals or fungemia (yeast infection of the bloodstream) in people with weakened immune systems, so use caution if your immunity is compromised.

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 your medications against this product if you take MAOIs (antidepressants) — this is the most serious interaction. Also flag it if you're on diabetes medications, lithium, or antifungal drugs.

Use the search tool below to verify your exact prescriptions.

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.

Nutritional yeast is a reasonable choice for someone looking to support IBS symptoms and who doesn't take MAOIs, diabetes drugs, lithium, or antifungals. If you're on any of those medication types, you'll need to skip this product or talk with your pharmacist first.

Anyone with a weakened immune system should check with their doctor before starting.

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

Assessment coverage: 1 of 2 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Sep 25, 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 Nutritional Yeast, straight from the product label.

Brand Dr. Berg
Barcode (UPC) 602573435823
Net contents 270 Tablet(s)
Market status On market
Date entered into DSLD Sep 25, 2024
DSLD ID 316069
Product type Botanical With Nutrients
Supplement form Tablet Or Pill
Dietary claims / uses Nutrient, All Other, Structure/Function
Intended target group(s) Adult (18 - 50 Years)
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 Nutritional Yeast by Dr. Berg, 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:
7 Tablet(s)
Maximum serving Sizes:
7 Tablet(s)
Servings per container
38
UPC/BARCODE
602573435823
IngredientAmount% DV
Total Carbohydrates2 Gram(s)1%
Protein9 Gram(s)17%
Total Fat1 Gram(s)1%
Calories22 Calorie(s)--
Nutritional Yeast5.6 Gram(s)--
Vitamin B11.8 mcg78%

Other ingredients: Microcrystalline Cellulose, Dicalcium Phosphate, Vanilla Flavor, Silicon Dioxide, Magnesium Stearate, Stevia

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.
Suggested/Recommended/Usage/Directions

Suggested use: As a dietary supplement, take 7 tablets daily. Chew tablets or grind up in the blender and mix with other foods or a shake.

Precautions

Caution: Do not exceed recommended dose. Do not use if safety seal is damaged or missing.

Pregnant or nursing mothers, children under the age of 18, and individuals with known medical conditions should consult a physician before using this or any dietary supplement.

Pregnant or nursing mothers, children under the age of 18, and individuals with known medical conditions should consult a physician before using this or any dietary supplement.

Storage

Store in a cool, dry place, with a lid.

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.

General Statements

To reorder: shop.drberg.com (800) 816-8184

Typical profile of naturally occurring vitamins and minerals in nutritional yeast per serving: Thiamine 0.053 mg (5% DV), ribolflavin 0.778 mg (60% DV), niacin 6 mg (39% DV), vitamin B6 0.15 mg (9% DV), folate (folacin or folic acid) 56 mcg (14% DV), biotin 7 mcg (26% DV), pantothenic acid 1 mg (31% DV), calcium 128 mg (10% DV), iron 16 mg (86% DV), magnesium 8 mg (2% DV), zinc 3 mg (28% DV), selenium 22 mcg (40% DV), chloride 109 mg (5% DV), sodium 4 mg (< 1% DV), potassium 113 mg (2% DV)

Formulation

No synthetic vitamins added

Formula

Natural B12 (methylcobalamin) added to enhance the naturally produced B-Vitamin complex in yeast.

No synthetic vitamins added Natural B12 (methylcobalamin) added to enhance the naturally produced B-vitamin complex in yeast

FDA Statement of Identity

Dietary Supplement

Brand IP Statement(s)

Dr. Berg The knowledge doc

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

See for yourself

Nutritional Yeast by Dr. Berg label

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

Nutritional 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 Nutritional Yeast by Dr. Berg

These are the 3 active ingredients this product is made of. Select any to open its full monograph.

Serving size7 Tablet(s) Dosage formTablet Or Pill Servings per container38 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

9 Gram(s) per serving

Nutritional Yeast

Interacts with
136 drugs
5.6 Gram(s) 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...

Nutritional Yeast monograph & interactions

Vitamin B1

1.8 mcg per serving Form: Methylcobalamin, Nutritional Yeast

Other (inactive) ingredients: Microcrystalline Cellulose, Dicalcium Phosphate, Vanilla Flavor, Silicon Dioxide, Magnesium Stearate, Stevia. These complete the product’s ingredient list but are not active constituents.

Interaction report

Nutritional Yeast by Dr. Berg Drug Interactions

Want to check YOUR meds against Nutritional 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

Nutritional Yeast 136

Individual Drug Interactions

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

1 of the 3 ingredients in Nutritional Yeast interact with drugs. Each result below shows which ingredient is responsible. Nutritional Yeast

Each ingredient & the kinds of drugs it affects

For each ingredient in Nutritional 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.

Nutritional 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
Nutritional Yeast full monograph & interactions
The maker

Brand information

Manufacturer and brand details for Nutritional Yeast, from the product label.

Dr. Berg

Name
Dr. Berg Nutritionals
Street Address
4501 Ford Avenue
City
Alexandria
State
VA
ZipCode
22302
Phone Number
800-816-8184
Web Address
shop.drberg.com
Pharmacist Counseling Corner

Nutritional Yeast by Dr. Berg: Common Questions

Does Nutritional Yeast by Dr. Berg interact with any medications?
Yes. Based on its ingredients, Nutritional 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?
Nutritional Yeast contains 3 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.
Will nutritional yeast give me gas?
Possibly. Flatulence is the most common side effect reported in people who take it. Some folks, especially those who are sensitive to yeast, may also feel intestinal discomfort. If that happens, you might try a smaller dose or stop.
Can I take this if I'm pregnant or breastfeeding?
The safety of concentrated nutritional yeast supplements during pregnancy and breastfeeding hasn't been well studied. Eating it in food amounts is probably fine, but supplement doses are different — talk with your provider before starting to get advice tailored to you.
Does nutritional yeast actually work for what it claims?
Research shows it's possibly effective for IBS. For the other conditions on the label — like hay fever or high cholesterol — we don't have enough reliable evidence yet to say whether it works. Your pharmacist can help you decide if it's worth trying for your specific need.
Can nutritional yeast cause headaches?
Yes. Migraine-like headaches are one of the most common side effects, especially in people who are sensitive to yeast. If you get a headache after starting it, that's likely a sign this product isn't right for you.
Is there a risk if I have a weak immune system?
Yes, there's a rare concern that brewer's yeast might cause a yeast infection of the bloodstream (fungemia) in people with compromised immunity. If your immune system is weakened, talk with your doctor before using this product.
What's the difference between nutritional yeast and brewer's yeast?
Nutritional yeast is deactivated (the yeast cells are dead), while some brewer's yeast products contain live organisms. The one in this product is based on brewer's yeast, and some of the safety concerns — like gas or interactions — come from that ingredient.

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

Not sure if Nutritional Yeast is safe with your meds?

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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.

Nutritional Yeast label
Go deeper

The Full Monographs Behind Nutritional 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

Nutritional 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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