Kveik

A culture name, not one strain

Kveik is the Norwegian word for yeast, and in brewing it names the farm cultures kept in western Norway. It does not identify a single strain, species or commercial sachet. Nofima notes that traditional cultures were not sterile and could contain more than one yeast species and lactic-acid bacteria. Each farm culture needs its own evidence; findings from a cultured isolate do not describe every organism in the original culture.

The 2018 genetic study sampled nine Norwegian kveik sources and, for comparison, a Lithuanian farmhouse ale yeast, then purified colonies for genetic and laboratory tests. The original cultures, the isolates and the strains in those tests are related but distinct things. Among the Norwegian strains sampled, the study found a distinct genetic grouping of domesticated Saccharomyces cerevisiae, which explains much of the interest in kveik without identifying every culture sold or shared under the name.

Farmhouse beer and the culture behind it

Kveik belongs to a farmhouse brewing tradition. The beers are called maltol or kornol, are made mainly from malted barley, are commonly hopped and are sometimes infused with juniper branches. The 2018 study reports from older sources that brewers collected yeast from the fermentation foam or the bottom slurry, dried it between brewing sessions, and borrowed a replacement from a neighbour if their own culture failed.

The same literature mentions yeast-storage logs, one dated to at least 1621. That attests an old preservation practice in the cited literature, not the age or provenance of any particular culture now called kveik. The older Norwegian sources behind these reports were not independently checked for this page.

Local lineages and neighbouring names

Local geography and brewing practice shaped distinct cultures. The research literature studies selected Norwegian kveik samples, while a later comparative study distinguishes western Norwegian kveik from sampled cultures called gong in Hallingdal and berm in Telemark. The names therefore should not be flattened into a generic northern farmhouse yeast category. Commercial products may use a selected isolate, which is not automatically equivalent to a family's retained culture.

A commercial Voss product as one example

Lallemand identifies LalBrew Voss as a Saccharomyces cerevisiae brewing yeast and says it came from a culture maintained by Sigmund Gjernes in Voss. The manufacturer lists its own fermentation range and product-specific pitching and packet-storage guidance. Those specifications describe this packaged product, not every traditional kveik lineage or every yeast sold under a regional style name, and a data sheet is not independent validation of a traditional culture.

Carriers and what is known about reuse

Nofima describes traditional yeast rings and sticks that were immersed in fermenting foam or yeast sediment, then hung to dry and reused. This documents a preservation practice in some settings. It does not establish one carrier design, drying condition, storage life, revival process or contamination-control procedure for all kveik. The laboratory studies use their own controlled procedures and do not fill those household-care gaps.

Research limits

A general culture composition, dose, propagation method, household drying or revival protocol, storage period and safety validation are not established. A culture's name, dried appearance or reported fermentation speed cannot establish its identity, viability, purity or suitability for a particular beer. No general handling directions or limits are supplied here.