White Labs WLP630 Berliner Weisse Blend blends a traditional German Weizen yeast and Lactobacillus to create a subtle, tart, drinkable beer. It can take several months to develop tart character. This blend is perfect for the traditional Berliner Weisse. White Labs yeast is world-renowned for quality and innovation, certified kosher, GMO free, and subject to thorough quality analysis before being packaged.