Lactobacillus delbrueckii bulgaricus
Useful mainly for people wanting general yogurt-type gut support.
Quick decision guide
May help most
people wanting general yogurt-type gut support
Common dosing range
1-50 billion CFU/day
When to expect effects
Weeks
Watch out for
avoid if severely immunocompromised or critically ill
What is it
Lactobacillus delbrueckii bulgaricus is a strain of beneficial bacteria sold in dietary supplements, primarily as a probiotic. Found on roughly 1,495 U.S. supplement labels.
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 |
|---|---|---|---|
general gut and digestive support Mixed Evidence | Small and variable | Generally healthy adults using it as part of a fermented-food or multi-strain regimen | Weeks |
general gut and digestive support
- Effect
- Small and variable
- Best fit
- Generally healthy adults using it as part of a fermented-food or multi-strain regimen
- Time
- Weeks
Evidence for 1 use
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
general gut and digestive support
Supplement benefitLactobacillus delbrueckii bulgaricus is a long-used yogurt fermentation organism that transits the gut and may interact with the microbiome and intestinal barrier. Evidence for this specific strain on defined digestive outcomes is limited and largely indirect, and effects are strain-specific so results from one strain do not transfer to another.
Bottom line: A reasonable low-risk general gut probiotic, but do not expect it to treat a specific condition.
How it works
How to take it
What to track
2 commercial forms
Compare the main delivery options and what they’re best suited for.
Capsule (shelf-stable or refrigerated)
Most common probiotic format.
Some capsules use delayed-release coatings to protect bacteria from stomach acid.
Powder or sachet
Useful for higher doses or for people who do not swallow capsules.
Mixed into cold liquids or food; heat reduces viability.
Safety
Know the common side effects, key cautions, and who should avoid it.
Common side effects
Serious risks
Rare bacteremia in severely immunocompromised or critically ill people
Who should avoid it
- Severely immunocompromised
- Critically ill
- People with central venous catheters
Pregnancy & breastfeeding
Generally tolerated in pregnancy and breastfeeding, but consult a provider when in doubt.
Interactions
Can reduce viable bacteria; many people separate doses by a few hours
Food sources
| Food | Amount | %DV |
|---|---|---|
| Yogurt with live cultures | Varies by product | — |
| Kefir | Varies by product | — |
| Fermented vegetables (sauerkraut, kimchi) | Varies by product | — |
Yogurt with live cultures
- Amount
- Varies by product
- %DV
- —
Kefir
- Amount
- Varies by product
- %DV
- —
Fermented vegetables (sauerkraut, kimchi)
- Amount
- Varies by product
- %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
What does Lactobacillus delbrueckii bulgaricus do?⌄
Lactobacillus delbrueckii bulgaricus is a probiotic bacterium. Effects depend on the strain and the condition being addressed. Many users take it for general digestive support.
Do I need to refrigerate it?⌄
Some probiotic products require refrigeration to maintain viable counts; others are shelf-stable. Follow the storage instructions on the label.
How long should I take a probiotic?⌄
Probiotic effects are generally only present while you are taking the product. Most people who notice a benefit continue use; if you see no effect after 4-8 weeks, you may want to try a different strain or stop.
References by claim
general gut and digestive support
Wang et al., 2026 — PubMed (2026) link
Track Lactobacillus delbrueckii bulgaricus 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.