White Labs WLP815 Belgian Lager Yeast is a clean, crisp European lager yeast with low sulfur production. The strain originates from a very old brewery in West Belgium. It is great for European style pilsners, dark lagers, Vienna lager, and American style lagers. White Labs yeast is world-renowned for quality and innovation, certified kosher, GMO free, and subject to thorough quality analysis before being packaged.