Interactions on record — worth a quick check against your medications. Based on 2 of 6 ingredients. Check your meds →
Dietary supplement

GUT Ingredients & Drug Interactions

by Primal Pharm

GUT label
See full label image
Capsule Category: Other Combinations
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 23, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking GUT 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: Moderate

GUT is a dietary supplement by Primal Pharm with 6 active ingredients. Its ingredients are commonly taken for digestive health and balance, diarrhea (including antibiotic-related), vaginal yeast and bacterial infections.Based on those ingredients, 182 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are Lactobacillus acidophilus La-14. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against GUT by Primal Pharm

Ask about any prescription or over-the-counter medication and we check it for interactions with GUT by Primal Pharm — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of GUT by Primal Pharm

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 Aug 6, 2026

What’s inside

Low disclosure
Ingredient Transparency · database check
Low

Most active ingredients don't disclose an individual amount — you can't tell how much of each you're getting.

Why this rating?
  • The label discloses an exact amount for 0 of its 6 active ingredients.
  • “Proprietary Blend of Probiotic Bacteria” is a proprietary blend — the label doesn't break down how much of each component you get.

Primal Pharm GUT contains 6 active ingredients: four probiotic bacterial strains (Lactobacillus paracasei Lpc-37, Lactobacillus acidophilus La-14, Bifidobacterium lactis Bl-04, and Lactobacillus plantarum Lp-115), plus fructooligosaccharide (a plant fiber that feeds beneficial bacteria) and a Marine Polysaccharide Complex. The inactive ingredients are cellulose, rice maltodextrin, and L-leucine — standard capsule fillers and binders.

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
Moderate

Some clinical evidence supports this product's ingredients for its stated purpose, but it isn't conclusive.

Why this rating?
  • The label markets this product for: Probiotic supplement for digestive and gut health.
  • We looked for evidence on: Antibiotic-associated diarrhea, Bacterial vaginosis, Clostridioides difficile infection, Colic, Constipation, Helicobacter pylori — and 4 related terms.
  • The strongest evidence on file: Lactobacillus Acidophilus is rated "Possibly Effective" for Antibiotic-associated diarrhea (Natural Medicines).
  • Also on file: Lactobacillus Acidophilus is rated "Possibly Effective" for Bacterial vaginosis, Helicobacter pylori, Irritable bowel syndrome (IBS).
  • Also on file: Fructo-oligosaccharides (fos) is rated "Insufficient Reliable Evidence To Rate" for Constipation.

Evidence for probiotics in this product is mixed. Lactobacillus acidophilus is possibly effective for irritable bowel syndrome (IBS), Helicobacter pylori infection, antibiotic-associated diarrhea (loose stool from antibiotics), and bacterial vaginosis — meaning some research supports it, but more data would help.

It's rated possibly ineffective for atopic disease (allergic skin and respiratory conditions), and we don't have enough reliable evidence yet to rate it for acute respiratory distress syndrome (ARDS). Fructooligosaccharide hasn't been rated with sufficient evidence for osteoporosis, constipation, diabetes, travelers' diarrhea, or high cholesterol.

We hold no effectiveness data for the other bacterial strains or the marine polysaccharide.

The evidence, ingredient by ingredient Lactobacillus Acidophilus Fructo-oligosaccharides (fos)

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 2 of the 2 matched ingredients.
  • Pregnancy & breastfeeding safety ratings cover 2 of 2.
  • General safety write-ups exist for 2 of 2.
  • Remember: this measures how much safety information exists. Thin data is not the same as being safe.

Lactobacillus acidophilus is generally well tolerated in healthy adults and children. However, live probiotic organisms can theoretically cause infection in some patients — there are rare case reports of translocation (bacteria moving where they shouldn't) leading to serious complications like bloodstream infection or inflammation of the heart lining, though most of these occurred in people with other underlying conditions.

When combined with other probiotics, GI side effects like stomach discomfort, bloating, gas, diarrhea, or vomiting can occur, but they're uncommon. Fructooligosaccharide commonly causes gas and bloating, especially at higher doses — though studies show doses under 10 grams daily are generally mild.

Pregnancy and lactation safety data are limited; talk with your doctor or pharmacist about whether this product is right for you if you're pregnant or nursing.

Side effects, ingredient by ingredient Lactobacillus Acidophilus Fructo-oligosaccharides (fos)

Meds to double-check

Moderate interaction found
Known Interaction Concern · database check
Moderate identified

The most serious documented interaction for these ingredients is Moderate. Check your medications for a personalized result.

Why this rating?
  • 1 of the 2 matched ingredients can interact with medications — Lactobacillus Acidophilus.
  • The most serious interaction on file is rated Moderate.
  • For scale: 182 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.

Separate this product from antibiotic drugs by a few hours — taking them together may reduce how well the live probiotic bacteria survive and work. No other medication interactions are documented for the ingredients we could check, but run your full medication list through the tool on this page to be sure.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with some supporting evidence for its stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

GUT may help with IBS, antibiotic-related diarrhea, or other digestive concerns where the evidence is "possibly effective," though the research isn't definitive yet. If you're on antibiotics, space them several hours apart from this supplement so the probiotic bacteria don't get killed off.

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

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

Assessment coverage: 2 of 6 active ingredients matched to our full ingredient reviews (monographs). Based on the product label dated Nov 22, 2022.

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 GUT, straight from the product label.

Brand Primal Pharm
Barcode (UPC) 704260216828
Net contents 60 Capsule(s)
Market status On market
Date entered into DSLD Nov 22, 2022
DSLD ID 276399
Product type Other Combinations
Supplement form Capsule
Dietary claims / uses 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 GUT by Primal Pharm, 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 Vegetable Capsule(s)
Maximum serving Sizes:
2 Vegetable Capsule(s)
Servings per container
30
UPC/BARCODE
704260216828
IngredientAmount% DV
Lactobacillus paracasei Lpc-370 NP--
Lactobacillus acidophilus La-140 NP--
Fructooligosaccharide0 NP--
Bifidobacterium lactis Bl-040 NP--
Marine Polysaccharide Complex0 NP--
Proprietary Blend of Probiotic Bacteria0 NP--
Lactobacillus plantarum Lp-1150 NP--

Other ingredients: Cellulose, Rice Maltodextrin, L-Leucine

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 two (2) capsules once daily. For best results, take one (1) capsule during the day and one (1) capsule in the evening. Repeat the process daily. Do not exceed two capsules per day.

Formulation

This product is formulated with 40 billion CFU per 2 caps and to deliver a minimum potency of 20 billion CFU per 2 caps through the best by date.

Promotes healthy digestion Helps neuro-transmitter focus Promotes mental clarity

Precautions

Keep out of reach of children.

Do not use if safety seal is damaged or missing.

Storage

Store in a cool, dry place.

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.

Brand IP Statement(s)

Primal Pharm Est. 2020

FDA Statement of Identity

Probiotic Supplement

Dietary Supplement

Seals/Symbols

Manufactured in a FDA Registered Facility GMP Quality Good Manufacturing Practice Certification NSF Registered Facility Made in U.S.A.

General Statements

100% Money Back Guarantee

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

See for yourself

GUT by Primal Pharm label

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

GUT 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 GUT by Primal Pharm

These are the 6 active ingredients this product is made of. Select any to open its full monograph.

Serving size2 Vegetable Capsule(s) Dosage formCapsule Servings per container30 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.

Proprietary Blend of Probiotic Bacteria

0 NP per serving

Other (inactive) ingredients: Cellulose, Rice Maltodextrin, L-Leucine. These complete the product’s ingredient list but are not active constituents.

Interaction report

GUT by Primal Pharm Drug Interactions

Want to check YOUR meds against GUT?

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
182Drugs
182 Moderate

Ingredients driving the most interactions

Lactobacillus acidophilus La-14 182

Individual Drug Interactions

The ingredients in GUT interact with 182 drugs. Click any drug to see the details.

1 of the 6 ingredients in GUT interact with drugs. Each result below shows which ingredient is responsible. Lactobacillus acidophilus La-14

Each ingredient & the kinds of drugs it affects

For each ingredient in GUT 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.

Lactobacillus acidophilus La-141 drug type · 182 drugs

Antibiotic Drugs

Theoretically, taking Lactobacillus acidophilus with antibiotic drugs might decrease the effectiveness of L. acidophilus.
L. acidophilus preparations usually contain live and active organisms. Therefore, simultaneously taking antibiotics might kill a significant number of the organisms. Tell patients to separate administration of antibiotics and L. acidophilus preparations by at least two hours.

Likelihood Probable Evidence D
Lactobacillus acidophilus La-14 full monograph & interactions
The maker

Brand information

Manufacturer and brand details for GUT, from the product label.

Primal Pharm

See all Primal Pharm products
Name
Primal Pharm
Street Address
3090 Bristol Street
City
Costa Mesa
State
CA
ZipCode
92626
Web Address
www.primalpharm.com
Pharmacist Counseling Corner

GUT by Primal Pharm: Common Questions

Does GUT by Primal Pharm interact with any medications?
Yes. Based on its ingredients, GUT has a known interaction with 182 medications. Use the checker to see how it interacts with a specific drug.
How can one product interact with so many drugs?
GUT contains 6 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 this probiotic work if I'm taking an antibiotic?
Not well if you take them at the same time. Antibiotics kill bacteria, including the live organisms in this supplement. Talk to your pharmacist about spacing your antibiotic and this product a few hours apart so the probiotic has a chance to work.
Can GUT cause side effects?
Gas, bloating, and stomach discomfort are the most common complaints, especially from the fructooligosaccharide content or when combining multiple probiotics. These are usually mild and uncommon. In rare cases, the live bacteria have been linked to serious infections in people with weakened immune systems, so check with your doctor if you have one.
Is this safe to take if I'm pregnant?
Lactobacillus acidophilus is rated possibly safe in pregnancy, but we don't have complete safety data for all the other ingredients in this formula. Talk it over with your doctor or midwife so they can weigh the potential benefits against what you need right now.
What does the Marine Polysaccharide Complex do?
We don't have effectiveness or safety data on file for that ingredient, so we can't tell you what role it plays in this product. Your pharmacist might have more details about the brand's formulation.
How much fructooligosaccharide is in this?
The product facts don't specify the dose, so check the label or call the manufacturer. Doses over 10 grams daily are more likely to cause gas and bloating.
Can I take this while breastfeeding?
The safety data for breastfeeding isn't on file for the ingredients in this product. Talk with your doctor or pharmacist before starting to make sure it's right for you and your baby.

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

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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.

GUT label
Go deeper

The Full Monographs Behind GUT’s Ingredients

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

Herb & supplement monograph

Lactobacillus Acidophilus

Interacts with 182 drugs

Lactobacillus acidophilus is a 'friendly' bacterium used as a probiotic to support gut and vaginal health. It is generally well tolerated in healthy people, and there is reasonable evidence...

Read the full Lactobacillus Acidophilus monograph → Herb & supplement monograph

Fructo-oligosaccharides (fos)

Fructo-oligosaccharides (FOS) are a type of soluble fiber that acts as a prebiotic, meaning they feed the helpful bacteria in your gut. They are generally considered safe for most people in...

Read the full Fructo-oligosaccharides (fos) monograph →
Sources

Sources & How We Checked

GUT'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 21 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.

Lactobacillus Acidophilus 15 references
  1. Pierce A. The American Pharmaceutical Association Practical Guide to Natural Medicines. New York: The Stonesong Press, 1999:19.
  2. Begtrup LM, de Muckadell OB, Kjeldsen J, Christensen RD, Jarbøl DE. Long-term treatment with probiotics in primary care patients with irritable bowel syndrome--a randomised, double-blind, placebo controlled trial. Scand J Gastroenterol 2013;48(10):1127-35 PubMed
  3. Chatterjee S, Kar P, Das T, Ray S, Gangulyt S, Rajendiran C, Mitra M. Randomised placebo-controlled double blind multicentric trial on efficacy and safety of Lactobacillus acidophilus LA-5 and Bifidobacterium BB-12 for prevention of antibiotic-associated
  4. Shavakhi A, Tabesh E, Yaghoutkar A, Hashemi H, Tabesh F, Khodadoostan M,Minakari M, Shavakhi S, Gholamrezaei A. The effects of multistrain probiotic compound on bismuth-containing quadruple therapy for Helicobacter pylori infection: a randomized placebo-c
  5. Karamali M, Dadkhah F, Sadrkhanlou M, et al. Effects of probiotic supplementation on glycaemic control and lipid profiles in gestational diabetes: a randomized, double-blind, placebo-controlled trial. Diabetes Metab 2016;42(4):234-41. PubMed
  6. Badehnoosh B, Karamali M, Zarrati M, et al. The effects of probiotic supplementation on biomarkers of inflammation, oxidative stress and pregnancy outcomes in gestational diabetes. J Matern Fetal Neonatal Med. 2018 May;31(9):1128-1136.
  7. Kumar S, Kumar R, Rohilla L, Jacob N, Yadav J, Sachdeva N. A high potency multi-strain probiotic improves glycemic control in children with new-onset type 1 diabetes mellitus: A randomized, double-blind, and placebo-controlled pilot study. Pediatr Diabete
  8. Shahriari A, Karimi E, Shahriari M, Aslani N, Khooshideh M, Arab A. The effect of probiotic supplementation on the risk of gestational diabetes mellitus among high-risk pregnant women: A parallel double-blind, randomized, placebo-controlled clinical trial PubMed
  9. Xiao SD, Zhang DZ, Lu H, et al. Multicenter, randomized, controlled trial of heat-killed Lactobacillus acidophilus LB in patients with chronic diarrhea. Adv Ther. 2003;20(5):253-60.
  10. Rossi F, Amadoro C, Gasperi M, Colavita G. Lactobacilli infection case reports in the last three years and safety implications. Nutrients. 2022;14(6):1178. PubMed
  11. Ozer M, Goksu SY, Shahverdiani A, Mustafa M. Lactobacillus acidophilus-induced endocarditis and associated splenic abscess. Case Rep Infect Dis 2020;2020:1382709.
  12. Sadrin S, Sennoune S, Gout B, et al. A 2-strain mixture of Lactobacillus acidophilus in the treatment of irritable bowel syndrome: A placebo-controlled randomized clinical trial. Dig Liver Dis 2020;52(5):534-540. PubMed
  13. Stoffer JN, Slingsby TJ, Giuliari GP. Lactobacillus acidophilus endophthalmitis after intravitreal bevacizumab injection requiring intraocular lens explantation. Can J Ophthalmol 2022;57(1):e21-e22. PubMed
  14. Cukovic-Cavka S, Likic R, Francetic I, Rustemovic N, Opacic M, Vucelic B. Lactobacillus acidophilus as a cause of liver abscess in a NOD2/CARD15-positive patient with Crohn's disease. Digestion 2006;73(2-3):107-10.
  15. Hui J, Ren Y, Wang Y, Han Q. Lactobacillus acidophilus endophthalmitis postcataract operation: A case report with a literature review. Ocul Immunol Inflamm 2023.

See these in context on the Lactobacillus Acidophilus monograph →

Fructo-oligosaccharides (fos) 6 references
  1. Briet F, et al. Symptomatic response to varying levels of fructo-oligosaccharides consumed occasionally or regularly. Eur J Clin Nutr 1995;49:501-7.
  2. Bouhnik Y, Vahedi K, Achour L, et al. Short-chain fructo-oligosaccharide administration dose-dependently increases fecal bifidobacteria in healthy humans. J Nutr 1999;129:113-6. PubMed
  3. Cummings JH, Macfarlane GT, Englyst HN. Prebiotic digestion and fermentation. Am J Clin Nutr 2001;73:415S-420S. PubMed
  4. Souza DDS, Tahan S, Weber TK, Araujo-Filho HB, de Morais MB. Randomized, double-blind, placebo-controlled parallel clinical trial assessing the effect of fructooligosaccharides in infants with constipation. Nutrients. 2018;10(11). pii: E1602. PubMed
  5. Andermann TM, Fouladi F, Tamburini FB, et al. A Fructo-Oligosaccharide Prebiotic Is Well Tolerated in Adults Undergoing Allogeneic Hematopoietic Stem Cell Transplantation: A Phase I Dose-Escalation Trial. Transplant Cell Ther 2021;27(11):932. PubMed
  6. Dou Y, Yu X, Luo Y, Chen B, Ma D, Zhu J. Effect of Fructooligosaccharides Supplementation on the Gut Microbiota in Human: A Systematic Review and Meta-Analysis. Nutrients 2022;14(16):3298. PubMed

See these in context on the Fructo-oligosaccharides (fos) 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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