Yeast for Hard Seltzer Renaissance Yeast is a leader in the development of classical crossbred (non-GMO) H2S-preventing Saccharomyces yeast, based on a unique strain of yeast, UCD932, that was recently isolated by the University of California, Davis which is naturally incapable of producing hydrogen sulfide. Renaissance has developed a full range of yeasts bred specifically for their favorable fermentation attributes in hard cider. Each strain has a proven lineage, and is metabolically incapable of producing hydrogen sulfide. Hydrogen sulfide, even at levels below threshold, binds delicate aromas. Hard seltzer, produced with Renaissance Saccharomyces strains, that contain no hydrogen sulfide are bright, clean and have outstanding aromas.