Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Lactobacillus johnsonii

Probiotic

Useful mainly for people seeking strain-specific adjunct support during H. pylori management.

Quick decision guide

May help most

people seeking strain-specific adjunct support during H. pylori management

Common dosing range

1–10 billion CFU/day (strain-dependent)

When to expect effects

Weeks

Watch out for

benefits are strain-specific and do not transfer between strains

What is it

Lactobacillus johnsonii is a lactic acid-producing bacterium found in the human gut, infant feces, and some fermented dairy products. Specific strains like La-1 and No. 1088 are sold as probiotics.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You want an adjunct to standard H. pylori therapy with a studied strain

You tolerate probiotics well

You match the specific strain to the studied use

Probably skip if…

You expect a probiotic to replace H. pylori antibiotics

You are severely immunocompromised or critically ill

You assume any L. johnsonii product gives the same effect

Evidence at a glance

Goal	Effect	Best fit	Time
helicobacter pylori support Limited Evidence	Modest, adjunctive	people undergoing H. pylori eradication, as an add-on to standard therapy	Weeks

helicobacter pylori support

Limited Evidence

Effect: Modest, adjunctive
Best fit: people undergoing H. pylori eradication, as an add-on to standard therapy
Time: Weeks

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

helicobacter pylori support

Disease adjunct

Limited Evidence

The La-1 strain has been studied for suppressing Helicobacter pylori, with some reduction in bacterial load or improved tolerability of eradication therapy. Evidence is limited and strain-specific, so it is an adjunct rather than a standalone treatment.

Effect size

Modest, adjunctive

Time to effect

Weeks

Best fit

people undergoing H. pylori eradication, as an add-on to standard therapy

Bottom line: A strain-specific adjunct that may help during H. pylori therapy but does not replace it.

SourceCruchet et al., 2003 — PubMed Pantoflickova et al., 2003 — PubMed

How it works

Like other lactobacilli, L. johnsonii ferments sugars to produce lactic acid, lowering local pH and competing with less favorable gut bacteria for nutrients and surface attachment. Some strains produce antimicrobial peptides and adhere to gut epithelial cells, where they may influence local immune signaling. Strain-specific properties matter substantially in probiotic research. La-1 has been studied for Helicobacter pylori suppression; No. 1088 has been studied for acid-related symptoms. Effects observed for one strain do not automatically extend to another.

How to take it

1. Typical dose

1–10 billion CFU/day (depends on strain and product)

2. Timing

once daily, with or just before a meal to buffer stomach acid

3. With food

with or just before food

4. How long to try

Use through the treatment course; reassess with clinician

What to track

GI symptoms

tolerability of concurrent antibiotics

H. pylori test result via clinician

2 commercial forms

Compare the main delivery options and what they’re best suited for.

Lactobacillus johnsonii La-1

Strain originally isolated from human feces and developed by Nestle for probiotic dairy products.

Most studied strain; often delivered in fermented dairy.

Lactobacillus johnsonii No. 1088

Strain marketed for gastric symptom support.

Heat-treated (paraprobiotic) form available in some products.

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

mild bloating or gas initially

Serious risks

rare bacteremia in severely immunocompromised people or those with central venous catheters or damaged gut barriers

Who should avoid it

severely immunocompromised (chemotherapy, transplant, low-CD4 HIV)
critically ill patients
short bowel syndrome (consult clinician)
premature infants (specialized care only)

Pregnancy & breastfeeding

Generally considered low-risk, but discuss probiotic use with a clinician if pregnant.

Interactions

immunosuppressive drugsModerate

caution in seriously ill patients due to infection risk

antibioticsMinor

may reduce probiotic viability if co-administered; separate by at least 2 hours

Food sources

Food	Amount	%DV
Fermented dairy products containing the strain	Varies	—

Fermented dairy products containing the strain

Amount: Varies
%DV: —

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

exact strain designation (e.g. La-1, No. 1088)

guaranteed CFU through expiry

storage requirements stated

Be skeptical of…

"cures H. pylori"

generic "gut health" without strain data

implying strain interchangeability

Frequently asked questions

Will L. johnsonii cure H. pylori?⌄

No. It is not a substitute for prescription antibiotic eradication therapy. Some studies suggest it may complement treatment, but standard therapy remains essential.

Are all L. johnsonii products the same?⌄

No. Effects are strain-specific. La-1 and No. 1088 have been studied for different purposes and are not interchangeable.

References by claim

helicobacter pylori support

Cruchet et al., 2003 — PubMed (2003) link

Pantoflickova et al., 2003 — PubMed (2003) link

Track Lactobacillus johnsonii with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

Coming to App Store

Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.