WLP099 Super High Gravity Ale Yeast - White Labs Yeast Pure Pitch Next GenSuper High Gravity Ale Yeast ; from White Labs originates from England and can handle up to 25% abv! Great yeast to help restart stuck fermentations, especially big beers that typical yeast may stall out early on. This yeast can ferment up to 25% alcohol when used correctly. It produces ester characters that increase with increasing gravity. Malt character dominates at lower gravities. As with any high gravity beer, extra oxygenation and yeast