Wyeast liquid beer brewing yeast has been an industry leader for over three decades. Serving homebrewers and breweries around the World with fresh liquid yeast. Their 100 billion cell minimum Wyeast Smack-Pack Activator™ is an innovative product that provides fresh yeast for 6 months from the manufacture date. We will proudly replace any Wyeast that does not start fermenting in a starter. We highly recommend always doing a yeast starter and have top of the line yeast starter plates available. New to yeast starters? Check out our guide: How to Make a Yeast Starter.