Lactobacillus rhamnosus: probiotic strain

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Lactobacillus rhamnosus, now called Lacticaseibacillus rhamnosus, is a lactic acid bacterium found in the human gut and in certain fermented dairy products. Its best-known strain, LGG, is one of the most studied lactic ferments in the world.

Discover its origin, its main strains, its new classification, the state of research and our selection.

Lactobacillus rhamnosus: probiotic strain | NATURAMedicatrix

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Discover our top 3 products Lactobacillus rhamnosus

Lactipro-Immunity

Lactipro Buccal

Microbiote FORT (intestinal flora)

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NATURAMedicatrix

Lactipro-Immunity

30 gastro-resistant capsules

€16.95

NATURAMedicatrix

Lactipro Buccal

40 lozenges

€29.90

-10% New

Nutergia

ERGYPHILUS Plus

30 capsules

€14.31 €15.90

-10% New

Nutergia

Ergyphilus Children

14 sachets

€14.31 €15.90

-10% New

Nutergia

Ergykid Infantis

10 ml

€17.91 €19.90

-10%

nutrigée

Microbiote FORT (intestinal flora)

30 capsules

€16.65 €18.50

Active ingredients guide

Lactobacillus rhamnosus: the lactobacillus behind the LGG strain

Lactobacillus rhamnosus (often shortened to L. rhamnosus) is a lactic acid bacterium: it converts sugars into lactic acid. It occurs naturally in the human gut and mouth, as well as in certain cheeses and fermented milks.

Since the revision of the genus Lactobacillus published in 2020, its official scientific name has been Lacticaseibacillus rhamnosus, but the former name is still widely used on labels. Its most famous strain, LGG, is found in many lactic ferment formulas.

A lactic acid bacterium

It ferments sugars and produces lactic acid.

A new name

Lacticaseibacillus rhamnosus since 2020.

The LGG strain

Isolated in the 1980s and deposited under the reference ATCC 53103.

Profile

What is Lactobacillus rhamnosus?

A few pointers to place this bacterium among the lactobacilli:

A cousin of L. casei

Long regarded as a subspecies of Lactobacillus casei, hence the expression “casei rhamnosus” that is still encountered.

Rod-shaped

Like all lactobacilli, it appears under the microscope as small rods.

Many strains

LGG, LRa05, SGL06… each strain carries a code and has its own characteristics.

Origin and strains

Lactobacillus rhamnosus GG: where does the LGG strain come from?

The LGG strain was isolated from the human gut in 1985 by two American researchers, Sherwood Gorbach and Barry Goldin: the two “G”s in its name come from their initials. It is held in official culture collections under the reference ATCC 53103, which appears on the label of several supplements.

Other strains of L. rhamnosus are used in cheesemaking or in fermented milks. As with all bacteria, a distinction is made between the species and the strain: two strains of the same species can behave differently, which is why scientific studies always focus on a specific strain.

What research says

Lactobacillus rhamnosus benefits: where does the science stand?

The LGG strain is one of the most studied micro-organisms: it has been the subject of a very large number of publications. Researchers are particularly interested in its ability to adhere to the intestinal mucosa and in its place within the microbiota, in adults as well as in children.

To date, no health claim relating to Lactobacillus rhamnosus is authorised in the European Union. This research therefore does not allow any particular effect to be attributed to this bacterium or to a food supplement containing it.

Buying guide

How to choose an L. rhamnosus supplement?

An identified strain

The full name states the species and the strain code, for example GG ATCC 53103.

The amount in CFU

The number of bacteria is expressed in CFU (colony-forming units), per capsule or per daily dose.

Alone or combined

It is often combined with other lactic ferments, fibres or vitamins.

Storage

Keep the product dry and away from heat, following the instructions on the label.

Our selection

Our products containing Lactobacillus rhamnosus

Here are four formulas in which L. rhamnosus plays a major part. Find all our products containing Lactobacillus rhamnosus in the list above.

Microbiote FORT — 30 capsules

10 billion CFU of L. rhamnosus GG per 2 capsules, with Saccharomyces boulardii, chicory FOS, alpha-GOS and organic acacia fibre.

Discover Microbiote FORT →

Ergyphilus Plus — 30 capsules

16 billion L. rhamnosus GG ATCC 53103 per 4 capsules, among 32 billion lactobacilli and bifidobacteria.

Discover Ergyphilus Plus →

Lactipro-Immunité — 30 capsules

5 billion CFU of L. rhamnosus LRa05 per gastro-resistant capsule, with Lactococcus lactis JCM 5805, L. acidophilus, B. bifidum and vitamin D3.

Discover Lactipro-Immunité →

Ergyphilus Enfants — 14 sachets

1 billion Lacticaseibacillus rhamnosus GG ATCC 53103 per sachet, among 3 billion lactic ferments.

Discover Ergyphilus Enfants →

Frequently asked questions

Lactobacillus rhamnosus FAQ

What are the benefits of Lactobacillus rhamnosus?

Several strains, including LGG, are the subject of extensive research, but no health claim is authorised to date in the European Union for this bacterium. No recognised benefit can therefore be attributed to it.

What does “GG” mean in Lactobacillus rhamnosus GG?

They are the initials of Gorbach and Goldin, the two researchers who isolated the strain in 1985. LGG refers to a specific strain, not the whole species.

Is Lactobacillus casei rhamnosus the same bacterium?

Yes: L. rhamnosus was first classified as a subspecies of L. casei, before being recognised as a species in its own right. It is now called Lacticaseibacillus rhamnosus (not Lactiplantibacillus, a neighbouring genus).

Where can I buy Lactobacillus rhamnosus?

In pharmacies, organic shops and online. At NATURAMedicatrix, L. rhamnosus is included in Microbiote FORT, Ergyphilus Plus, Lactipro-Immunité and Ergyphilus Enfants, among others.

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NATURAMedicatrix
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9772 Troine (Wincrange)
Luxembourg
Call us: +33977423704
Email us:

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Up to 70% reimbursed

-10% sur notre sélection d'automne avec le code AUTOMNE26

Lactobacillus rhamnosus

Lactipro-Immunity

Lactipro Buccal

ERGYPHILUS Plus

Ergyphilus Children

Ergykid Infantis

Microbiote FORT (intestinal flora)

Lactobacillus rhamnosus: the lactobacillus behind the LGG strain

What is Lactobacillus rhamnosus?

A cousin of L. casei

Rod-shaped

Many strains

Lactobacillus rhamnosus GG: where does the LGG strain come from?

Lactobacillus rhamnosus benefits: where does the science stand?

How to choose an L. rhamnosus supplement?

An identified strain

The amount in CFU

Alone or combined

Storage

Our products containing Lactobacillus rhamnosus

Microbiote FORT — 30 capsules

Ergyphilus Plus — 30 capsules

Lactipro-Immunité — 30 capsules

Ergyphilus Enfants — 14 sachets

Lactobacillus rhamnosus FAQ

What are the benefits of Lactobacillus rhamnosus?

What does “GG” mean in Lactobacillus rhamnosus GG?

Is Lactobacillus casei rhamnosus the same bacterium?

Where can I buy Lactobacillus rhamnosus?

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