Harvest Yeast offers three different strains of Activate® Yeast for spirits. Our yeast is the world’s most efficient yeast for the profitable production of a high-quality tasting spirits. Our advanced yeast strains can ferment nearly 100% of all sugars to produce whiskey, neutral grain spirits and rum in 40-48 hours, while naturally generating the glucoamylase enzyme required to convert starch into fermentable sugars.