Lactobacillus delbrueckii lactis

ProbioticLactobacillus

What is it

Lactobacillus delbrueckii subsp. lactis (often labeled L. lactis) is a lactic acid bacterium used in dairy fermentation and as a probiotic in some multi-strain supplements.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

General probiotic support

Mixed Evidence

Specific clinical evidence for L. delbrueckii lactis as a standalone probiotic is limited. Most data come from multi-strain blends, making strain-specific claims difficult.

How it works

Like other lactobacilli, L. delbrueckii lactis ferments lactose to lactic acid, lowers gut pH, and may transiently colonize or interact with intestinal mucosa. It is used in yogurt starter cultures and contributes to dairy fermentation. As a probiotic, evidence is limited compared with more studied lactobacillus and bifidobacterium strains, and effects are likely strain-specific.

Dosage

No RDA. Probiotic blends typically supply 1-10 billion CFU per serving, with this species as one of several strains. DSLD does not report a median dose.

When and how to take it

No timing baseline established. Often taken with or just before a meal so the food buffers stomach acid; refrigerate refrigerated formulations.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Powder (multi-strain blends)

Most often combined with other lactobacilli and bifidobacteria.

Survival depends on encapsulation and storage.

Safety

Generally regarded as safe in healthy people. Rare cases of bacteremia have been reported in immunocompromised patients with various lactobacilli; this species is not specifically associated with such events but caution applies to the class.

Who should be cautious

People who are severely immunocompromised, have central venous catheters, or have recently undergone GI surgery should consult a clinician before using any probiotic.

Interactions

No significant interactions reported. Some clinicians recommend separating probiotic intake from antibiotic dosing by 2-3 hours.

Food sources

Yogurt (some cultures)

Amount
Variable CFU; not always quantified on label
%DV
—

Frequently asked questions

Is L. lactis the same as L. delbrueckii lactis?⌄

The names overlap but refer to different organisms. Lactococcus lactis is a separate species from Lactobacillus delbrueckii subsp. lactis. Check the full taxonomy on the label.

What does this probiotic do?⌄

It is primarily a dairy starter; its standalone health benefits in humans are not well established.

References

Lactobacillus delbrueckii lactis on Wikidata — Wikidata link

Lactobacillus delbrueckii lactis on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Lactobacillus delbrueckii lactis (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: 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.