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Dietary supplement

L. Gasseri Ingredients & Drug Interactions

by Custom Probiotics

L. Gasseri label
See full label image
Powder Category: Non-nutrient/non-botanical
Most serious interaction: Moderate
Clinical methodology reviewed by · Updated Sep 16, 2026 · Label data from the NIH DSLD
What is this page for?

First and foremost: checking L. Gasseri 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

L. Gasseri is a dietary supplement by Custom Probiotics with 1 active ingredient. Its ingredients are commonly taken for digestive health, weight and belly fat management, vaginal and urinary health.Based on those ingredients, 182 medications have a known interaction with it, the most serious rated moderate. The ingredients most likely to interact are L. gasseri. Use the checker below to test your specific medication, or read the full HelloPharmacist Interaction Report.

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Check Your Meds Against L. Gasseri by Custom Probiotics

Ask about any prescription or over-the-counter medication and we check it for interactions with L. Gasseri by Custom Probiotics — and tell you which ingredient is responsible.

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HelloPharmacist Scorecard of L. Gasseri by Custom Probiotics

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 13, 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 1 active ingredient.

This product contains a single active ingredient: Lactobacillus gasseri (L. gasseri), a live probiotic bacterium. The powder form delivers active organisms intended to reach your gut.

There are no other active ingredients, and no inactive fillers or binders are listed.

Does it work?

Couldn't assess
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
Not assessable

This is a single-ingredient Lactobacillus Gasseri product and its label doesn't state a use — see Lactobacillus Gasseri's own graded uses on its monograph.

Why this rating?
  • We looked at the product name, claims, and label statements and couldn't find a stated purpose to grade.

The evidence we hold does not establish that L. Gasseri is effective for the uses listed — allergic rhinitis (hay fever), aspirin-related stomach damage, asthma, bacterial vaginosis, the common cold, or diarrhea.

All of these carry a rating of insufficient evidence to judge. That doesn't mean it doesn't work; it means the data we have isn't strong enough to say one way or the other.

The evidence, ingredient by ingredient Lactobacillus Gasseri

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.

L. Gasseri is generally well tolerated in healthy adults, but the safety data is limited and incomplete.

Because it's a live microorganism, there is some concern that in certain patients it could cause infection — in rare cases, lactobacilli have been found in bloodstream infections (bacteremia), sepsis, and other serious conditions. These cases appear linked to bacteria moving from places where they naturally live (like the mouth) to other parts of the body.

Limited safety information means you should check with your doctor before using this product, especially if you have a compromised immune system or are seriously ill.

Side effects, ingredient by ingredient Lactobacillus Gasseri

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 1 matched ingredient can interact with medications — Lactobacillus Gasseri.
  • 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.

If you take antibiotic drugs, separate them from L. Gasseri — antibiotics can kill the live organisms and reduce how well the probiotic works.

Altogether, these interactions span 182 individual medications. Check your complete list of prescriptions and over-the-counter drugs on this page before starting.

Check your own medication Run your meds through the checker above

The bottom line

Scorecard at a glanceFormula with limited ingredient disclosure with no assessable stated purpose. Moderate medication interactions have been identified, and safety information is well characterized.

L. Gasseri is a single-strain probiotic with limited evidence of effectiveness for common conditions and incomplete safety data.

If you're interested in trying it, talk with your doctor or pharmacist first — particularly important if you're on antibiotics, take immunosuppressants, or have any serious underlying illness. They can help you decide whether it's right for you and how to time it with your other medications.

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 Sep 21, 2018.

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 L. Gasseri, straight from the product label.

Brand Custom Probiotics
Net contents 0 Not Present
Market status On market
Date entered into DSLD Sep 21, 2018
DSLD ID 181325
Product type Non-nutrient/non-botanical
Supplement form Powder
Dietary claims / uses All Other
Intended target group(s) Adult (18 - 50 Years), Children (All), Gluten Free, Dairy Free, Sugar 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 L. Gasseri by Custom Probiotics, 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:
0.1 Gram(s)
Maximum serving Sizes:
1.6 Gram(s)
IngredientAmount% DV
L. gasseri0 NP--

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

Directions of use: Dissolve 1-2 scoops (enclosed) of the dairy-free probiotic powder in one glass of purified water and drink it. Do this first thing in the morning and/or at bedtime.

Please read enclosed dosage suggestion or visit www.customprobiotics.com

Storage

Bottles should be kept tightly closed and stored in the refrigerator to retain maximum potency.

Formulation

Does not contain: Artificial colors, flavors, preservatives, sugar, gluten, soy, wheat or FOS.

Dairy free probiotic powder

General Statements

Ultra potency

200 billion cfu's per gram

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

See for yourself

L. Gasseri by Custom Probiotics label

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

L. Gasseri 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 L. Gasseri by Custom Probiotics

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

Serving size0.1 Gram(s) Dosage formPowder Amounts shown are per serving.

L. gasseri

Interacts with
182 drugs
0 NP per serving

Lactobacillus gasseri is a 'friendly' probiotic bacterium found naturally in the human gut, mouth, and vaginal tract, and in some fermented foods. Ear...

L. gasseri monograph & interactions
Interaction report

L. Gasseri by Custom Probiotics Drug Interactions

Want to check YOUR meds against L. Gasseri?

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

L. gasseri 182

Individual Drug Interactions

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

1 of the 1 ingredient in L. Gasseri interact with drugs. Each result below shows which ingredient is responsible. L. gasseri

Each ingredient & the kinds of drugs it affects

For each ingredient in L. Gasseri 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.

L. gasseri1 drug type · 182 drugs

Antibiotic Drugs

Theoretically, taking Lactobacillus gasseri with antibiotic drugs might decrease the effectiveness of L. gasseri.
Lactobacillus gasseri 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. gasseri preparations by at least two hours.

Likelihood Probable Evidence D
L. gasseri full monograph & interactions
The maker

Brand information

Manufacturer and brand details for L. Gasseri, from the product label.

Custom Probiotics

See all Custom Probiotics products
Name
Custom Probiotics, Inc.
City
Glendale
State
California
ZipCode
91214
Phone Number
(800) 219-8405
Web Address
www.customprobiotics.com
Pharmacist Counseling Corner

L. Gasseri by Custom Probiotics: Common Questions

Does L. Gasseri by Custom Probiotics interact with any medications?
Yes. Based on its ingredients, L. Gasseri 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?
L. Gasseri 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.
Can I take L. Gasseri at the same time as my antibiotic?
Not ideally. Antibiotics can kill off a significant portion of the live L. Gasseri organisms, which reduces the probiotic's effectiveness. Talk with your doctor or pharmacist about how far apart to space them — usually several hours, but it depends on which antibiotic you're taking.
Does L. Gasseri actually work for diarrhea, hay fever, or asthma?
The evidence we have doesn't establish that it works for any of those. All six uses listed here — diarrhea, allergic rhinitis, asthma, bacterial vaginosis, aspirin-related stomach damage, and the common cold — are marked insufficient evidence. More research is needed.
Is L. Gasseri safe for healthy people?
It's generally well tolerated in healthy adults, but the safety data is limited. Because it's a live organism, there's some concern it could cause infection in certain people — especially those with weakened immune systems. Talk with your doctor before starting, particularly if you have any serious illness or take medications that suppress your immune system.
Can L. Gasseri cause side effects?
The product facts note a theoretical concern that it could cause infection in some patients — in rare cases, related lactobacilli have been found in serious bloodstream and other infections. However, complete side-effect data isn't on file here. Your doctor or pharmacist can discuss your individual risk.
Is there anything in this powder besides the L. Gasseri?
No inactive fillers or other ingredients are listed. You're getting the live organism and nothing else.

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

Not sure if L. Gasseri is safe with your meds?

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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.

L. Gasseri label
Go deeper

The Full Monographs Behind L. Gasseri’s Ingredients

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

Herb & supplement monograph

Lactobacillus Gasseri

Interacts with 182 drugs

Lactobacillus gasseri is a 'friendly' probiotic bacterium found naturally in the human gut, mouth, and vaginal tract, and in some fermented foods. Early research suggests it may help with di...

Read the full Lactobacillus Gasseri monograph →
Sources

Sources & How We Checked

L. Gasseri'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 12 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 Gasseri 12 references
  1. Pierce A. The American Pharmaceutical Association Practical Guide to Natural Medicines. New York: The Stonesong Press, 1999:19.
  2. Ramachandran L, Dontaraju VS, Patel K. Lactobacillus-associated spontaneous bacterial peritonitis in a liver cirrhosis patient on probiotics. Cureus. 2020;12(12):e11896. PubMed
  3. 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
  4. Ranchal P, Gupta R, Goldberg R, A Lobo S, Pascual A, El Khoury MY. Penicillin-sensitive Lactobacillus jensenii bacteremia. Am J Ther 2021;28(2):e250-e252. PubMed
  5. Grazioli-Gauthier L, Rigamonti E, Leo LA, Martinetti Lucchini G, Lo Priore E, Bernasconi E. Lactobacillus jensenii mitral valve endocarditis: Case report, literature review and new perspectives. IDCases 2022;27:e01401. PubMed
  6. Toprak NU, Bozan T, Yilmaz S, Buyukbayrak EE, Tigen ET. Polymicrobial bacteremia due to Lactobacillus jensenii and Veillonella montpellierensis in a pregnant patient; case report and review of literature. Anaerobe 2022;75:102576. PubMed
  7. Chazan B, Raz R, Shental Y, Sprecher H, Colodner R. Bacteremia and pyelonephritis caused by Lactobacillus jensenii in a patient with urolithiasis. Isr Med Assoc J 2008;10(2):164-5.
  8. Ramos-Coria D, Canto-Losa J, Carrillo-Vázquez D, Carbajal-Morelos L, Estrada-León R, Corona-Rodarte E. Lactobacillus gasseri liver abscess and bacteremia: a case report. BMC Infect Dis 2021;21(1):518. PubMed
  9. Elikowski W, Malek-Elikowska M, Lisiecka M, Bodora A, Wisniewska K, Oko-Sarnowska Z. Lactobacillus gasseri endocarditis on the aortic valve bioprosthesis - a case report. Pol Merkur Lekarski 2017;43(257):220-223.
  10. Esquibel A, Dababneh AS, Palraj BR. Lactobacillus gasseri causing bilateral empyema. Case Rep Infect Dis 2017;2017:4895619.
  11. Tleyjeh IM, Routh J, Qutub MO, Lischer G, Liang KV, Baddour LM. Lactobacillus gasseri causing Fournier's gangrene. Scand J Infect Dis 2004;36(6-7):501-3. PubMed
  12. Dickgiesser U, Weiss N, Fritsche D. Lactobacillus gasseri as the cause of septic urinary infection. Infection 1984;12(1):14-6. PubMed

See these in context on the Lactobacillus Gasseri 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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