White Labs Inc. Pure Yeast and Fermentation team members have been active in the American and worldwide craft brewing movements since the 1980s. The company, with headquarters in San Diego, Calif., and offices in Davis, Calif., Boulder, Colo., Chicago, Illinois, Copenhagen, Denmark and soon in Asheville, North Carolina, provides a wealth of services to brewers, winemakers, distillers and others in the fermentation business.
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White Labs Yeast Guarantee: Find it here.
GMO Free: White Labs Yeast is not derived frm 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.
QC sheet: 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 in, and enter your lot number. Or visit your order history and click on the lot number for your order.