Bifidobacterium animalis lactis
Useful mainly for people wanting help with bowel regularity or prevention of antibiotic-associated diarrhea.
Quick decision guide
May help most
people wanting help with bowel regularity or prevention of antibiotic-associated diarrhea
Common dosing range
1–20 billion CFU/day
When to expect effects
2–4 weeks for regularity
Watch out for
Severely immunocompromised or critically ill people face a small bacteremia risk
What is it
Bifidobacterium animalis subsp. lactis is one of the most commonly used probiotic bacteria in commercial yogurts and supplements. It is notable for its robustness, surviving manufacturing, storage, and gastrointestinal transit better than many other Bifidobacterium species.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Effect | Best fit | Time |
|---|---|---|---|
constipation and bowel regularity Good Evidence | Modest improvement in transit and stool frequency | adults with constipation or sluggish transit using a studied strain (e.g. DN-173 010, HN019) | 2–4 weeks |
gut microbiota modulation Limited Evidence | Measurable shifts in microbiota composition | people wanting to increase Bifidobacteria and short-chain fatty acid production | Weeks |
respiratory tract infections Limited Evidence | Small reduction in incidence/duration | people seeking modest reduction in common respiratory infections (e.g. BL-04) | Weeks of ongoing use |
constipation and bowel regularity
- Effect
- Modest improvement in transit and stool frequency
- Best fit
- adults with constipation or sluggish transit using a studied strain (e.g. DN-173 010, HN019)
- Time
- 2–4 weeks
gut microbiota modulation
- Effect
- Measurable shifts in microbiota composition
- Best fit
- people wanting to increase Bifidobacteria and short-chain fatty acid production
- Time
- Weeks
respiratory tract infections
- Effect
- Small reduction in incidence/duration
- Best fit
- people seeking modest reduction in common respiratory infections (e.g. BL-04)
- Time
- Weeks of ongoing use
Evidence for 3 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
constipation and bowel regularity
Supplement benefitRandomized trials of specific B. animalis subsp. lactis strains report improved colonic transit time and stool frequency. Benefits are strain-specific, so results from one strain do not guarantee another performs the same.
Bottom line: Certain B. lactis strains modestly improve bowel regularity over a few weeks.
gut microbiota modulation
Biomarker supportB. animalis subsp. lactis transiently increases Bifidobacteria and short-chain fatty acid production, measurably altering the colonic environment. These are microbiota/biomarker changes that do not by themselves prove a clinical benefit.
Bottom line: This species reliably shifts gut microbiota markers, though that is not itself a clinical outcome.
respiratory tract infections
Supplement benefitSome trials of specific strains report fewer or shorter respiratory infections, but results are inconsistent across populations and strains. The evidence is preliminary.
Bottom line: B. lactis may modestly reduce respiratory infections, but evidence is limited and strain-specific.
Evidence is mixed
Benefit appears in some strain-specific trials but not consistently across studies.
How it works
How to take it
What to track
4 commercial forms
Compare the main delivery options and what they’re best suited for.
B. animalis subsp. lactis BB-12
Most extensively researched strain in this species. Used in many branded yogurts and supplements globally.
Robust acid and bile tolerance, well-studied
B. animalis subsp. lactis DN-173 010
Used in Activia and similar branded yogurts. Studied for bowel regularity in adults.
Studied for transit and constipation
B. animalis subsp. lactis HN019
Used in adult and senior probiotic formulations targeting immune and digestive function.
Studied for immunity and constipation
B. animalis subsp. lactis BL-04
Used in immune-targeted supplements, often with Lactobacillus strains.
Studied for respiratory applications
Safety
Know the common side effects, key cautions, and who should avoid it.
Common side effects
Serious risks
rare bacteremia in immunocompromised or critically ill people
Who should avoid it
- severely immunocompromised individuals
- people with central venous catheters
- critically ill patients
- premature infants except under specialist supervision
Pregnancy & breastfeeding
Generally well tolerated in pregnancy and breastfeeding.
Interactions
antibiotics can kill the organisms; separate doses by at least 2 hours
may slightly raise the risk of bacterial translocation
Food sources
| Food | Amount | %DV |
|---|---|---|
| Activia yogurt (DN-173 010) | Approximately 10^9 to 10^10 CFU per serving | — |
| Other commercial yogurts with added BB-12 | Variable; check label for live culture content | — |
| Kefir | Variable Bifidobacterium content | — |
Activia yogurt (DN-173 010)
- Amount
- Approximately 10^9 to 10^10 CFU per serving
- %DV
- —
Other commercial yogurts with added BB-12
- Amount
- Variable; check label for live culture content
- %DV
- —
Kefir
- Amount
- Variable Bifidobacterium content
- %DV
- —
Choosing a product
What to look for on the label — and what to be skeptical of.
Look for…
Be skeptical of…
Frequently asked questions
Why is BB-12 the most studied probiotic?⌄
BB-12 was one of the first commercially developed probiotic strains optimized for survival through manufacturing, storage, and digestion. Its long market presence has allowed for extensive research across many applications.
Is Activia yogurt actually effective for digestion?⌄
Trials of B. animalis DN-173 010 (used in Activia) show modest improvements in transit time and bowel regularity. Effects are small but real for many people, particularly those with mild constipation.
How quickly does B. animalis work for constipation?⌄
Trials typically show effects emerging over 2 to 4 weeks of consistent daily use. Effects reverse after stopping supplementation.
Can I take this with other probiotics?⌄
Yes. B. animalis subsp. lactis is commonly combined with Lactobacillus and other Bifidobacterium strains in multi-strain formulations.
Does it need to be refrigerated?⌄
Most B. animalis subsp. lactis supplements maintain potency at room temperature for the shelf life on the label, especially if encapsulated. Refrigeration generally extends viability.
References by claim
Track Bifidobacterium animalis lactis with Pilora
Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.
Coming to App StoreDisclaimer: 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.