Herb & supplement monograph

Lactobacillus Jensenii Drug Interactions, Uses, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Lactobacillus Jensenii interacts with medications. The heart of this page is the interaction list — every drug Lactobacillus Jensenii is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Lactobacillus Jensenii is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Interaction report

Drugs that interact with Lactobacillus Jensenii

182 medications have a known interaction with Lactobacillus Jensenii, graded by severity. Select any drug for the full evidence-based detail.

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Tell us the medications you take and we’ll check each one against Lactobacillus Jensenii using our pharmacist-reviewed interaction data.

AI summaries are generated from our Lactobacillus Jensenii interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

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What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Lactobacillus Jensenii combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Lactobacillus Jensenii affects

Every type of medication (drug category) Lactobacillus Jensenii is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 1 drug category Lactobacillus Jensenii interacts with

Antibiotic Drugs

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

Likelihood Probable Evidence D

Monograph

Lactobacillus Jensenii: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Lactobacillus jensenii is one of the natural 'good' bacteria found in a healthy vagina, and it is sometimes added to probiotic products marketed for vaginal health. While its role in the body is well recognized, there is only limited human research on taking it as a supplement, so the benefits are not proven. Talk with your pharmacist or doctor before using it, especially if you have a weakened immune system.

Scientific name: Lactobacillus jensenii
Family: Lactobacillaceae
Part used: Whole live bacteria (probiotic strain)
Common forms: Capsules, vaginal suppositories, multi-strain probiotic blends, powders

People commonly use it for

Vaginal health
Maintaining healthy vaginal flora
Bacterial vaginosis support
Yeast infection support
General probiotic use

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally considered low risk for healthy people, but supplement evidence is limited and quality varies.

PregnancyInsufficient reliable information

There is insufficient reliable information available about the safety of Lactobacillus jensenii during pregnancy and lactation. However, there are cur...

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

There is insufficient reliable information available about the safety of Lactobacillus jensenii during pregnancy and lactation. However, there are cur...

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Lactobacillus jensenii is a type of friendly bacteria that naturally lives in the human body, especially in the vagina. Along with a few other Lactobacillus species, it is one of the main bacteria that help keep the vaginal environment healthy and acidic.

Because it is part of the normal, healthy flora, some companies include it in probiotic supplements and vaginal products aimed at supporting vaginal health. It may be sold on its own or, more often, combined with other Lactobacillus strains in a blend.

It is important to know that not all probiotic products contain this exact strain, and the amount and quality can differ a lot between brands.

Uses & effectiveness

People most often look to Lactobacillus jensenii and similar probiotics for vaginal health. This includes trying to support a healthy balance of bacteria, helping with bacterial vaginosis (BV), or reducing the chance of yeast infections.

The science behind these uses is limited and not conclusive. Researchers do know that women with healthy vaginal flora tend to have more Lactobacillus bacteria, including L. jensenii. But that does not automatically mean that taking it as a supplement will fix or prevent problems. Most studies on vaginal probiotics use mixed strains, and results have been inconsistent.

In short, this strain is recognized as an important natural part of vaginal health, but high-quality human evidence that taking it as a supplement clearly helps is lacking. More research is needed.

How it works

In the vagina, Lactobacillus bacteria like L. jensenii produce lactic acid, which keeps the environment slightly acidic. This acidic setting makes it harder for harmful bacteria and yeast to grow.

Some Lactobacillus strains may also produce hydrogen peroxide and other substances that can slow the growth of unwanted microbes, and they may compete with harmful organisms for space and nutrients.

Most of this understanding comes from laboratory studies and observations of natural body flora. How well a swallowed or applied supplement reaches and changes the body's bacteria is not fully understood.

Safety & precautions

For most healthy people, Lactobacillus probiotics are generally considered to have a low risk of harm. However, the supplement form of L. jensenii has not been studied in detail, so its long-term safety is not well established.

People with a weakened immune system, serious illness, or central lines or other medical devices should be cautious, because live bacteria have rarely caused infections in vulnerable people. Talk to your doctor first if this applies to you.

For pregnancy and breastfeeding, there is not enough reliable safety information about taking this as a supplement. To be safe, avoid it or use it only with your doctor's guidance during these times.

Always choose products from reputable companies, and check with your pharmacist or doctor before starting any new supplement.

Side effects

Probiotic products are usually well tolerated. The most common side effects are mild and may include gas, bloating, or stomach upset, especially when first starting.

When used vaginally, some people may notice mild irritation or discharge. Rarely, live bacteria can cause serious infections in people who are very ill or have weakened immune systems.

Stop using the product and contact a healthcare provider if you have signs of infection, fever, severe discomfort, or any reaction that worries you.

Lactobacillus Jensenii: Reported Adverse Effects

Documented safety reports on Lactobacillus Jensenii from the evidence-graded Natural Medicines (TRC Healthcare) database, shown word-for-word from the licensed record.

Reports by condition

Sepsis Immunologic

Since Lactobacillus jensenii preparations contain live and active microorganisms, there is some concern that they might cause pathogenic infection in some patients. L. jensenii has been isolated in cases of bacteremia, sepsis, prostate abscess, perinephric abscess, endocarditis, and pulmonary septic emboli. These cases are thought to be due to the translocation of bacteria from other locations in the body in which they occur naturally, such as the oral cavity, or the gastrointestinal or urogenital tract, and not to dietary or supplemental intake.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

Adverse-effects data: Natural Medicines, Therapeutic Research Center

Dosing

There is no official or standardized dose for Lactobacillus jensenii. Probiotic amounts are often measured in colony-forming units (CFUs), and products vary widely.

The best approach is to follow the directions on the product label and not exceed the recommended amount. Because formulas and strains differ, ask your pharmacist or doctor for help choosing a product and deciding whether it is appropriate for you.

Pregnancy & Breastfeeding

Lactobacillus Jensenii & Pregnancy

Insufficient reliable information

There is insufficient reliable information available about the safety of Lactobacillus jensenii during pregnancy and lactation. However, there are currently no reasons to expect safety concerns when used appropriately.

Lactobacillus Jensenii & Breastfeeding

Insufficient reliable information

Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center

References & further reading

The 6 references that drive our Lactobacillus Jensenii monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

Pierce A. The American Pharmaceutical Association Practical Guide to Natural Medicines. New York: The Stonesong Press, 1999:19.
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
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
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
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
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.

Keep reading

This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.

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.

Pharmacist Counseling Corner

Lactobacillus Jensenii: Common Questions

Does Lactobacillus Jensenii interact with prescription medications?

Yes. We list 182 medications with a known interaction with Lactobacillus Jensenii. Use the checker above to see how Lactobacillus Jensenii interacts with a specific drug.

How are Lactobacillus Jensenii interactions rated?

Each interaction is graded major, moderate, or minor based on how clinically significant it is and the strength of the evidence behind it. Major interactions are the most serious and are best avoided, or used only under close professional supervision.

Is it safe to take Lactobacillus Jensenii with my medications?

It depends on the specific medication. Some combinations are fine, while others call for monitoring, timing changes, or should be avoided. Check your exact drug above and confirm with your pharmacist or doctor before starting, stopping, or changing anything.

Where does this Lactobacillus Jensenii interaction information come from?

Our interaction data is built on the Natural Medicines database — an evidence-graded reference for vitamins, herbs, and supplements — and is reviewed by licensed HelloPharmacist pharmacists, who may add clinical context.

What is Lactobacillus Jensenii used for?

It is a friendly bacteria naturally found in the vagina, and people most often use it in probiotic products aimed at supporting vaginal health, such as maintaining healthy flora or helping with bacterial vaginosis. Evidence that supplements work for these uses is limited.

Is Lactobacillus Jensenii safe to take?

For most healthy people, Lactobacillus probiotics are generally considered low risk, but this specific strain has not been studied in detail as a supplement. People with weakened immune systems should check with a doctor first.

Can I use it during pregnancy or while breastfeeding?

There is not enough reliable safety data for use as a supplement during pregnancy or breastfeeding, so it is best to avoid it unless your doctor approves.

How is it different from other probiotics?

Lactobacillus Jensenii is one of several Lactobacillus species that naturally live in the vagina, so it is often marketed for vaginal rather than digestive health. Many products combine it with other strains.

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

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