Omega Yeast Labs has a propagation process orientated around producing metabolically strong yeast to result in healthy fermentations. Omega's process aims to generate the optimal number of yeast cells, which may vary from strain from strain, to provide the best and most consistent performance for each particular yeast strain. The majority of strains that Omega provides contain at least 150 billion viable yeast cells at packaging. Each Omega liquid beer yeast we sell will come with a free ice pack, and we will proudly replace any Omega liquid beer yeast 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.