Limosilactobacillus fermentum

Limosilactobacillus fermentum suppliers and sourcing guide

Limosilactobacillus fermentum, named Lactobacillus fermentum until 2020, is a heterofermentative lactic acid bacterium found in fermented dairy, cereal and plant foods such as sourdough. Commercial strains are grown by fermentation, concentrated, mixed with cryoprotectants and freeze-dried. Brands buy named strains as freeze-dried powder at a stated CFU per gram, and the species also appears in some sourdough and cocoa fermentation starters.

See suppliers What to ask for on the COA

Category: Probiotics, cultures and yeasts
Also known as: Lactobacillus fermentum · L. fermentum
Facts checked: November 2026

Forms and grades of limosilactobacillus fermentum

Suppliers sell different products under the same name. Specify the one you need.

Freeze-dried concentrate
Pure L. fermentum powder at a high count stated in billions of CFU per gram, sold for dilution or blending by the buyer.
Standardized dilution
Concentrate diluted with a carrier such as maltodextrin, microcrystalline cellulose or potato starch to a fixed lower count, which is easier to dose in capsules, sachets and powders.
Named strain
A specific strain identified by a culture-collection deposit number or a trade designation, sold with that strain's own documentation; the strain designation belongs on the specification.
Fermentation starter
Cultures for sourdough, cereal or cocoa fermentations, dosed per batch and judged by acidification performance rather than label count.

What to check on the COA

Compare each result with your own specification when the lot arrives.

Viable count (CFU/g): Plate count on MRS agar under the conditions the supplier's method states, reported as CFU per gram against a minimum; some suppliers also report flow cytometry counts (ISO 19344). The count, not the weight, sets how much goes into each batch.
Identity: Species confirmed by 16S rRNA gene sequencing or a species-specific PCR, and the strain confirmed against the deposited strain by a strain-level method such as whole-genome sequencing or a strain-specific PCR.
Water activity: Water activity of the powder measured with a water activity meter against a low maximum, since viable counts fall faster in moister powder.
Contaminant microbiology: Non-lactic contaminants such as Enterobacteriaceae or coliforms, E. coli, Staphylococcus aureus, yeast and mold, plus absence of Salmonella and Listeria monocytogenes in a stated sample size.
Heavy metals: Lead, arsenic, cadmium and mercury by ICP-MS, mostly a reflection of the carrier and cryoprotectants in the powder.
Allergen statement: Declaration of milk, soy or other allergens used in the growth medium or carrier, which buyers need for their own label review.

Storage, lots and expiry

Storage and shelf life

Freeze-dried concentrates are usually kept frozen (around -18 °C or colder) or refrigerated, sealed in foil or other moisture- and oxygen-barrier packs, often with desiccant or a nitrogen flush. Let a cold pack reach room temperature before opening so moisture does not condense on the powder, and reseal partly used packs at once. Shelf life is set by the supplier from real-time stability counts at a stated temperature, and aged stock is retested for viable count before use.

Lots and expiry dates

Record the actual CFU/g on each lot's COA, since counts vary between lots and set the amount needed per batch, along with the strain designation and carrier. Rotate stock FEFO and build in the overage your stability data calls for so the finished product still meets its label count at the end of shelf life.

Regulatory status

Facts from regulators and standards bodies, each linked to its source.

Health Canada's Probiotics monograph for natural health products lists Limosilactobacillus fermentum (formerly Lactobacillus fermentum) as a medicinal ingredient, and the licence application and label must give the strain designation.
Source: webprod.hc-sc.gc.ca (opens in a new tab)
FDA's GRAS Notice Inventory lists GRN 531 for Lactobacillus fermentum CECT5716 for use in powdered milk-based infant formula, notified by Biosearch Life; it closed on March 20, 2015 with FDA having no questions. The notice covers that notifier's strain and intended use only.
Source: hfpappexternal.fda.gov (opens in a new tab)
FDA's draft guidance on dietary supplements containing live microbials states its intent to exercise enforcement discretion so that firms may declare live microbial quantity in colony forming units (CFUs), in addition to the weight declaration required by regulation.
Source: fda.gov (opens in a new tab)

This is general information, not regulatory advice. Status differs by country and by how the ingredient is used, so check the rules for your product and market.

Limosilactobacillus fermentum suppliers

Manufacturers and distributors whose own websites say they sell it.

We are checking limosilactobacillus fermentum suppliers now

Every listing is checked against the supplier’s own website before it goes live, so this list fills in over the coming weeks. The specs and COA checklist above are ready today.

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Frequently asked questions

What forms of limosilactobacillus fermentum can brands buy?

Common forms include freeze-dried concentrate, standardized dilution, named strain and fermentation starter. Ask each supplier for the specification sheet of the exact grade they quote.

What should the COA for limosilactobacillus fermentum include?

Expect viable count (CFU/g), identity, water activity, contaminant microbiology, heavy metals and allergen statement, each with its method, specification and result for that lot.

How should limosilactobacillus fermentum be stored?

What is the regulatory status of limosilactobacillus fermentum?

Health Canada's Probiotics monograph for natural health products lists Limosilactobacillus fermentum (formerly Lactobacillus fermentum) as a medicinal ingredient, and the licence application and label must give the strain designation. FDA's GRAS Notice Inventory lists GRN 531 for Lactobacillus fermentum CECT5716 for use in powdered milk-based infant formula, notified by Biosearch Life; it closed on March 20, 2015 with FDA having no questions. The notice covers that notifier's strain and intended use only. FDA's draft guidance on dietary supplements containing live microbials states its intent to exercise enforcement discretion so that firms may declare live microbial quantity in colony forming units (CFUs), in addition to the weight declaration required by regulation.

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