The chart below shows the general White Labs practices for making yeast with the FlexCell™ system. The system incorporates long-standing practices at White Labs -- such as thorough testing at every phase, custom ordering and stringent quality control standards -- with new technologies, specifically the process of making and shipping the yeast in the same package. The entire process takes 17 days per batch, for testing and yeast growth, although most strains are available for immediate shipping because fresh yeast clears QC every day at White Labs.
White Labs Yeast Guarantee: Find it here.
GMO-Free: White Labs Yeast is not derived from or produced using GMOs or their derivatives, and all reasonable steps have been taken to avoid contamination from GMOs or their derivatives, and this has been verified by a traceability/identity preservation system. A summary flow chart for this process can be found here.
Kosher: White Labs yeast is certified kosher.
Certificate of Laboratory Analysis: All White Labs yeast and enzymes, whether for commercial purposes or homebrew, is certified with a thorough QC analysis, and these reports are available on yeastman.com. Visit the site and click on the "Yeast QC Reports" button, or visit the lab section after you log in and enter your lot number. Or visit your order history and click on the lot number for your order.