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Kefir cultures

Kefir cultures suppliers and sourcing guide

Kefir is a fermented milk traditionally made with kefir grains, clusters of lactic acid bacteria, acetic acid bacteria and yeasts held in a polysaccharide matrix called kefiran. Most commercial producers use freeze-dried or frozen direct-set kefir cultures instead, defined blends of lactococci, Leuconostoc, lactobacilli and yeasts, because grains vary in makeup and are hard to standardize. Brands buy grains for traditional small-batch products and defined cultures, sized in units per volume of milk, for scale.

See suppliersWhat to ask for on the COA
Also known as
kefir grains · kefir starter culture · direct-set kefir culture
Facts checked
November 2026

Forms and grades of kefir cultures

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

  • Kefir grains

    Live grains, fresh or dried, that are reused batch after batch; their microbial makeup is undefined and shifts over time.

  • Direct-set freeze-dried culture

    Defined blend of bacteria and yeast in sachets sized for a volume of milk, used once per batch.

  • Frozen direct-to-vat culture

    Frozen pellets of a defined kefir blend for larger dairies.

  • Non-dairy kefir culture

    Blends formulated for coconut, oat or other plant bases, where the supplier states which sugars the culture needs.

  • Water kefir grains

    A different culture (tibicos) for fermenting sugar water or juice, not interchangeable with milk kefir grains.

What to check on the COA

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

Composition and counts
The species in the culture, with counts for lactic acid bacteria (on MRS or M17 agar) and yeasts (on a yeast medium) reported separately.
Acidification activity
Time to reach a set pH in standard milk at a stated temperature, the culture house's measure of how fast the lot will work in the vat.
Contaminant microbiology
Coliforms, E. coli, Staphylococcus aureus, mold, and absence of Salmonella and Listeria monocytogenes in a stated sample size.
Identity
Species in a defined culture confirmed by sequencing or PCR; grains are usually described by their dominant species rather than a fixed list.
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 and frozen kefir cultures are kept frozen or refrigerated as the supplier specifies, sealed in foil packs, and used whole once opened. Live grains are kept in fresh milk under refrigeration between batches or dried for longer storage. Shelf life of defined cultures is set by the supplier from activity data at the stated storage temperature.

Lots and expiry dates

Record the culture code, units and activity result for each lot of defined culture. For grains, record the source and the date of each transfer, and watch pH and fermentation time batch to batch, since grain makeup drifts.

Regulatory status

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

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.

Kefir cultures suppliers

Manufacturers and distributors whose own websites say they sell it.

We are checking kefir cultures 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 kefir cultures can brands buy?

Common forms include kefir grains, direct-set freeze-dried culture, frozen direct-to-vat culture, non-dairy kefir culture and water kefir grains. Ask each supplier for the specification sheet of the exact grade they quote.

What should the COA for kefir cultures include?

Expect composition and counts, acidification activity, contaminant microbiology, identity and allergen statement, each with its method, specification and result for that lot.

How should kefir cultures be stored?

Freeze-dried and frozen kefir cultures are kept frozen or refrigerated as the supplier specifies, sealed in foil packs, and used whole once opened. Live grains are kept in fresh milk under refrigeration between batches or dried for longer storage. Shelf life of defined cultures is set by the supplier from activity data at the stated storage temperature.

What is the regulatory status of kefir cultures?

The EU Novel Food Catalogue entry for kefir grains (POL-NF-15126) gives it the status not novel in food. 21 CFR 131.112 (cultured milk) lets the name of the food be accompanied by a traditional name or the organisms used, and gives "kefir cultured milk" as an example. Health Canada's Probiotics monograph lists Lactobacillus kefiranofaciens and Lentilactobacillus kefiri (formerly Lactobacillus kefiri) as medicinal ingredients, each requiring a strain designation.

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