Leuconostoc cremoris

Probiotic

What is it

Leuconostoc cremoris (recently reclassified as part of Leuconostoc mesenteroides subspecies cremoris) is a lactic acid bacterium widely used as a starter culture in dairy fermentation, particularly in buttermilk, sour cream, and certain cheeses. It also appears as a probiotic candidate in some supplements.

Evidence for 2 uses

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

Dairy fermentation (food technology)

Mixed Evidence

Well-established role as a starter culture in buttermilk, sour cream, and certain cheeses. Contributes to flavor and acidification. Not a direct supplement health benefit.

Probiotic gut support

Mixed Evidence

Preliminary research suggests Leuconostoc strains may contribute to gut microbiota balance. Clinical evidence is limited compared to better-studied probiotic species.

How it works

L. cremoris is a Gram-positive, heterofermentative lactic acid bacterium that produces lactic acid, acetic acid, ethanol, and carbon dioxide from sugars. In dairy fermentation it contributes to flavor (diacetyl production gives buttermilk its characteristic taste) and acidification. As a probiotic candidate, Leuconostoc species have less developed clinical evidence than Lactobacillus or Bifidobacterium. Preclinical studies suggest some Leuconostoc strains produce bioactive peptides, exopolysaccharides, and antimicrobial compounds that may benefit gut microbiota balance. Human clinical trials specifically for L. cremoris as a stand-alone probiotic are limited.

Dosage

There is no RDA. Probiotic supplements containing Leuconostoc species typically dose in CFU (colony-forming units) along with other strains, ranging from 10^8 to 10^10 per serving. Fermented dairy products provide natural exposure.

When and how to take it

Probiotic supplements can be taken any time, with or without food. Some clinicians suggest taking with meals to improve survival through stomach acid. Fermented dairy products provide ongoing exposure with no specific timing.

2 commercial forms

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

Fermented dairy with L. cremoris

Most exposure comes through buttermilk and similar cultured dairy.

Live cultures consumed in food matrix.

Probiotic supplement with Leuconostoc strain

Less common in commercial probiotic blends than Lactobacillus or Bifidobacterium.

Survival depends on formulation and storage.

Safety

Generally considered safe based on a long history in food fermentation. Rarely, Leuconostoc species can be involved in opportunistic infections in immunocompromised patients (Leuconostoc bacteremia has been documented in clinical settings). For healthy individuals at typical probiotic and food levels, safety is not a concern. No formal Tolerable Upper Intake Level has been established.

Who should be cautious

Immunocompromised individuals (cancer chemotherapy, HIV, organ transplant, central venous catheters) should consult a clinician before using concentrated probiotic supplements. Generally safe in pregnancy and breastfeeding at food and typical supplement levels.

Interactions

Limited interaction data. As with other probiotics, theoretical caution with immunosuppressants and antibiotics. Leuconostoc species are intrinsically resistant to vancomycin, which is relevant in clinical infection contexts.

Food sources

Buttermilk

Amount
1 cup
%DV
—

Sour cream (cultured)

Amount
1 tablespoon
%DV
—

Frequently asked questions

Is L. cremoris a probiotic?⌄

Some Leuconostoc strains are being studied as probiotic candidates. Clinical evidence is more limited than for established probiotic species.

Is it safe?⌄

Yes, in healthy individuals at food and supplement levels. People who are severely immunocompromised should consult a clinician before using concentrated probiotic supplements.

Where is L. cremoris naturally found?⌄

In cultured dairy products like buttermilk, sour cream, and certain cheese rinds.

References

Leuconostoc cremoris on Wikidata — Wikidata link

Leuconostoc cremoris on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Leuconostoc cremoris (PubMed search) — PubMed link

Track Leuconostoc cremoris with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

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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.