Backed By Science

We invest in the science and quality for providing the purest and freshest yeast so your brews can be consistent and delicious!

 A 21-day propagation with 38 quality checkpoints

To ensure the yeast is in optimal physiological condition for the best flavor production, highest viability, and multiple reuses, White Labs yeast utilizes a 21-day growth and testing program.

 FlexCell™ Technology

Our patented breathable-propagation material provides yeast to degas with minimal exposure to the environment, ensuring quality and purity in every package.

Absolute Quality Control w/ 38 Quality Checkpoints

Each culture undergoes a rigorous testing process from start to finish, which includes 38 quality checkpoints throughout the propagation cycle. 

Visit here to view the QC report for your lot of yeast.
  • White Labs cultures are monitored from our -80°C freezer through packaging.
  • Parameters, such as culture purity, accurate and precise cell counts, pH, cell density, attenuation, and microbiological contaminants, are monitored throughout the 21-day process.
  • ASBC Methods, in addition, to new molecular techniques are being used to test final your final products.
Testing for the STA1 (Diastatic) gene in our strains
All of our strains have been identified as either STA1+ or STA1- strains via PCR techniques. All strains are tested on LCSM wild yeast media which can easily detect STA1+ contamination. Additionally, molecular techniques, such as qPCR, are being used to detect STA1+ yeast in our cultures.

Groundbreaking qPCR Microbial Contaminants Panel

A proprietary multiplexed detection kit developed by Invisible Sentinel and White Labs. Utilizing qPCR technology, these novel detection kits can target a range of brewery contaminants at once, providing faster results, greater sensitivity, and a higher level of accuracy. To learn more: Click Here.

Grown for Performance

Grown directly from petri dishes into a maltose and nutrient-rich medium for 21 days, grown slow and optimized to provide the healthiest, most robust yeast, ready for your fermentation.


Patented propagation technology optimized for our brewer’s yeast cultures.
Cultures are held following the completion of propagation and validated at the time of final quality control process, against all specification standards. Samples of each batch in final packaging are retained at White Labs to assist with research and development. Our tests adhere to the guidelines of the American Society of Brewing Chemists, when applicable.


Proprietary software to track your culture through its lifecycle.White Labs Yeast Propagation Process