Probiotic

Lactobacillus acidophilus

Lactobacillus acidophilus is a lactic-acid-producing bacterium adapted to acidic conditions and exposure to bile. It ferments carbohydrates primarily into lactic acid.

Its fermentation activity contributes to a balanced intestinal environment and complements other probiotic species.

In everyday life, Lactobacillus acidophilus helps support a balanced gut environment and the kind of everyday digestive comfort that makes meals feel easier.

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

Lactobacillus acidophilus is a lactic-acid-producing bacterium adapted to acidic conditions and exposure to bile. It ferments carbohydrates primarily into lactic acid.

  • Scientific identity: Lactobacillus acidophilus; scientific identity: Lactobacillus acidophilus, genus retained 2020.
  • How it works: Ferments sugars to lactic acid: It converts available carbohydrate into lactic acid, lowering pH in its immediate surroundings and competing for the same nutrients and surfaces as other organisms. Passes through: Colonisation is not permanent — the population falls away within days of stopping, so any effect depends on continued daily intake.
  • Primary function: Its fermentation activity contributes to a balanced intestinal environment and complements other probiotic species.
  • What it supports: Lactobacillus acidophilus helps support a balanced gut environment and the kind of everyday digestive comfort that makes meals feel easier.
  • 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 Lactobacillus acidophilus for a clearly defined role within a thoughtfully balanced formulation.

  • Formulation purpose: Its fermentation activity contributes to a balanced intestinal environment and complements other probiotic species.
  • Used in: CARPEDIEM HappyGut 70B Probiotic, CARPEDIEM HappyGut 140B Probiotic and CARPEDIEM Men’s Daily Performance Stack.
  • Works alongside: Lactobacillus acidophilus complements Lactobacillus rhamnosus, Bifidobacterium longum and Bifidobacterium lactis to support everyday digestive wellness and complementary probiotic activity.
  • Meaningful contribution: Lactobacillus acidophilus helps support a balanced gut environment and the kind of everyday digestive comfort that makes meals feel easier. Contributes to everyday digestive comfort as part of a consistent probiotic routine.
  • Quality and scientific context: Effects depend on the exact bacterial strain, viable colony-forming units and appropriate storage conditions throughout shelf life. Research is shown only when an ingredient-specific study demonstrates a relevant benefit.

Ingredient intelligence

How it works

An acid-tolerant culture, and how that single trait shapes its whole journey.

Step 01 / 04

Survives the acid.

Its name means acid-loving. It handles low pH better than most species, so more of the dose reaches the gut alive.

01 / 04

Taxonomy

Lactobacillus acidophilus

Fermentation

Homofermentative - lactic acid only

Site of action

Small intestine, in the mucus layer

Gut behaviour

Transient - does not settle

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 gut environment through the activity of a recognised probiotic species.

Produces lactic acid while fermenting carbohydrates within the digestive environment.

Contributes to everyday digestive comfort as part of a consistent probiotic routine.

Adds an acid-tolerant bacterial culture suited to a multi-strain formulation.

Complements bifidobacteria and other beneficial species within the overall blend.

Supports microbial variety without depending on the activity of one species alone.

Helps support a balanced gut environment and the kind of everyday digestive comfort that makes meals feel easier.

Works alongside Lactobacillus rhamnosus and Bifidobacterium longum to create a more complete, complementary probiotic blend.

Selected research

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

01

Lactobacillus acidophilus DDS-1 and Bifidobacterium lactis UABla-12 Improve Abdominal Pain Severity and Symptomology in Irritable Bowel Syndrome: Randomized Controlled Trial

Nutrients

A randomised, double-blind, placebo-controlled multi-centre study in 330 adults aged 18 to 70 with IBS by Rome IV criteria. Participants received placebo, L. acidophilus DDS-1 or B. lactis UABla-12, each at 10 billion CFU/day, for six weeks. Both probiotic groups showed improvement over placebo on the Abdominal Pain Severity numeric rating scale and on IBS Symptom Severity Scale sub-scores covering abdominal pain, distension, bowel habits and quality of life, with normalisation of stool consistency.
2020
02

A 2-strain mixture of Lactobacillus acidophilus in the treatment of irritable bowel syndrome: A placebo-controlled randomized clinical trial (LAPIBSS)

Digestive and Liver Disease

A multicentre, double-blind, parallel-group, placebo-controlled randomised trial in 80 patients with irritable bowel syndrome. Participants took two capsules daily of either a two-strain Lactobacillus acidophilus mixture at 5 billion CFU per capsule or placebo for 8 weeks. The primary outcome was abdominal pain on a 100 mm visual analogue scale, with bloating, flatus, rumbling and bowel habits as secondary outcomes.
2020
03

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 Lactobacillus acidophilus

Explore the Carpediem formulations connected with this ingredient.

Complementary by function

Ingredient intelligence

How it works

An acid-tolerant culture, and how that single trait shapes its whole journey.

Step 01 / 04

Survives the acid.

Its name means acid-loving. It handles low pH better than most species, so more of the dose reaches the gut alive.

01 04

Taxonomy

Lactobacillus acidophilus

Fermentation

Homofermentative - lactic acid only

Site of action

Small intestine, in the mucus layer

Gut behaviour

Transient - does not settle

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