A dry lager yeast in an 11.5 gram package. Saflager S-23 is allegedly used by several commercial European breweries, and originates from the Institute of Brewing in Berlin, Germany. The optimum fermentation temperature is given as 51F to 75F but the most lager-like results are naturally achieved at the lower range of 51F to 59F. The results become more ale-like in the higher reaches of the amazingly wide temperature range. When used for lagers—following standard lager protocols—it would probably be advisable to do the actual lagering phase at no less than 45F to 50F.