Probiotic

Bifidobacterium longum

Bifidobacterium longum is an oxygen-sensitive bacterium commonly found in the human intestine. It uses a specialised fermentation pathway known as the bifid shunt to process carbohydrates.

Its fermentation produces compounds such as acetate and lactate that contribute to the wider gut microbial environment.

In everyday life, Bifidobacterium longum helps turn selected dietary fibres into useful gut compounds that support a balanced digestive environment.

Probiotic benefits are strain-specific. Verified strain identity, viable CFU and storage conditions are important quality considerations.

Available in

2 products

Ingredient overview

What it is

Bifidobacterium longum is an oxygen-sensitive bacterium commonly found in the human intestine. It uses a specialised fermentation pathway known as the bifid shunt to process carbohydrates.

  • Scientific identity: Bifidobacterium longum; main pathway: Bifid shunt, specialised carbohydrate fermentation.
  • How it works: Ferments fibre by the bifid shunt: It uses a carbohydrate route unique to the genus, and carries a broad enzyme set for breaking down dietary fibres that reach the colon undigested. Produces acetate and lactate: The bifid shunt yields acetic and lactic acid, which lower local pH and feed into the wider short-chain fatty acid pool.
  • Primary function: Its fermentation produces compounds such as acetate and lactate that contribute to the wider gut microbial environment.
  • What it supports: Bifidobacterium longum helps turn selected dietary fibres into useful gut compounds that support a balanced digestive environment.
  • Important consideration: Effects depend on the exact bacterial strain, viable colony-forming units and appropriate storage conditions throughout shelf life.

Formulation rationale

Why we use it

CARPEDIEM selected Bifidobacterium longum for a clearly defined role within a thoughtfully balanced formulation.

  • Formulation purpose: Its fermentation produces compounds such as acetate and lactate that contribute to the wider gut microbial environment.
  • Used in: CARPEDIEM HappyGut 70B Probiotic, CARPEDIEM HappyGut 140B Probiotic and CARPEDIEM Men’s Daily Performance Stack.
  • Works alongside: Bifidobacterium longum complements Bifidobacterium lactis, Lactobacillus acidophilus and Lactobacillus rhamnosus to support everyday digestive wellness and complementary probiotic activity.
  • Meaningful contribution: Bifidobacterium longum helps turn selected dietary fibres into useful gut compounds that support a balanced digestive environment. Produces acetate and lactate, compounds associated with normal microbial fermentation.
  • Quality and scientific context: Effects depend on the exact bacterial strain, viable colony-forming units and appropriate storage conditions throughout shelf life. 1 ingredient-specific study is included because the research reports a relevant benefit.

Ingredient intelligence

How it works

A colon-dwelling species that ferments by a route no other genus has.

Step 01 / 04

Protected in transit.

It is a strict anaerobe, meaning oxygen harms it, so packaging and capsule protection matter before it arrives.

01 / 04

Taxonomy

Bifidobacterium longum

Metabolic route

The bifid shunt - unique to this genus

Main products

Acetate and lactate

Oxygen

Strict anaerobe - oxygen-sensitive

Descriptive of the ingredient's established biology. Not a claim to diagnose, treat, cure or prevent any disease.

All key functions

The complete functional profile connected with this ingredient.

Supports a balanced intestinal microbiome through a naturally occurring bifidobacterial species.

Ferments selected dietary fibres and complex carbohydrates that reach the intestine.

Produces acetate and lactate, compounds associated with normal microbial fermentation.

Contributes to everyday digestive balance within a broader multi-strain probiotic blend.

Adds a bifidobacterial function that complements lactic-acid-producing cultures.

Supports microbial variety across different carbohydrate-processing pathways.

Helps turn selected dietary fibres into useful gut compounds that support a balanced digestive environment.

Works alongside Bifidobacterium lactis and Lactobacillus acidophilus to create a more complete, complementary probiotic blend.

Selected research

Open the original paper, PubMed record or DOI page for the full publication.

01

Probiotic Bifidobacterium longum NCC3001 Reduces Depression Scores and Alters Brain Activity: A Pilot Study in Patients With Irritable Bowel Syndrome

Gastroenterology

In this randomized pilot trial, the strain Bifidobacterium longum NCC3001 was studied in adults with irritable bowel syndrome for mood scores and brain responses. The findings are relevant to gut–brain research but remain strain-specific and exploratory.
2017
02

Usefulness of Bifidobacterium longum BB536 in Elderly Individuals With Chronic Constipation: A Randomized Controlled Trial

American Journal of Gastroenterology

A randomised, double-blind, placebo-controlled parallel-group trial in Japan enrolling 80 older adults with chronic constipation. Participants received B. longum BB536 at 50 billion CFU or placebo once daily for four weeks, assessed with the Constipation Scoring System. The overall primary endpoint was not significant, but the BB536 group improved on stool frequency versus placebo and few probiotic-related adverse events were seen.
2022
03

Integrated gut microbiome and metabolome analyses identified fecal biomarkers for bowel movement regulation by Bifidobacterium longum BB536 supplementation: A RCT

Computational and Structural Biotechnology Journal

A randomised, double-blind, placebo-controlled crossover trial in 24 adults who tended toward constipation. Participants took B. longum BB536 in acid-resistant seamless capsules or matched encapsulated starch for two weeks each. Bowel movement frequency was logged daily and faecal samples were analysed by combined 16S rRNA microbiome and metabolome profiling to identify markers associated with individual response.
2022
04

Impact of a probiotic product on bowel habits and microbial profile in participants with functional constipation: A randomized controlled trial

Journal of Digestive Diseases

94 otherwise healthy adults aged 18 to 65 with symptoms of functional constipation were randomised to placebo or a four-strain product at 15 billion CFU/day containing Lactobacillus acidophilus DDS-1, Bifidobacterium lactis UABla-12, Bifidobacterium longum UABl-14 and Bifidobacterium bifidum UABb-10 for four weeks. The probiotic group showed faster normalisation of stool frequency and consistency, with most participants reaching a normalised profile after one week.
2019

Products containing Bifidobacterium longum

Explore the Carpediem formulations connected with this ingredient.

Complementary by function

Ingredient intelligence

How it works

A colon-dwelling species that ferments by a route no other genus has.

Step 01 / 04

Protected in transit.

It is a strict anaerobe, meaning oxygen harms it, so packaging and capsule protection matter before it arrives.

01 04

Taxonomy

Bifidobacterium longum

Metabolic route

The bifid shunt - unique to this genus

Main products

Acetate and lactate

Oxygen

Strict anaerobe - oxygen-sensitive

Descriptive of the ingredient's established biology. Not a claim to diagnose, treat, cure or prevent any disease.