Brewer Reources —


The safety of our genetically modified yeast for brewing is paramount. Modern technology allows us to make minimal and ultra-precise changes to the yeast genome. In fact, we modify less than 0.0001% of the yeast genome to bring about the myriad of desired strain characteristics. 

  • All added genes are sourced from the genomes of brewing yeast itself or from edible plants and food-safe microbes.
  • We characterize each strain to make sure that the genetic modification is exactly as intended and no off-target modifications exist.
  • We check that strains do not differ significantly from non-engineered yeast in how they perform in propagation and fermentation.
  • We use state-of-the art methods to measure thousands of constituent molecules of beer brewed with our strains as compared to beer brewed with non-engineered yeast. We make sure that nothing other than the engineering target molecules are changed in concentrations.
  • We subject each strain to comprehensive safety review as dictated by the FDA under the Generally Recognized as Safe (GRAS) framework.
  • The vast majority of the yeast is removed before beer is packaged.