Featured Yeast

One of our most popular strains:

A-18 London Ale III

One of the most popular strains for modern juicy, hazy, and New England IPAs. A true top-cropping strain with a fruity ester profile, and a soft palate. This strain pairs well with American citrus and tropical hops for hazy IPAs. Originally used for English pale ales, this yeast can leave a bit of residual sweetness. However, in heavily hopped beers the attenuation can creep upwards of 80%. Due to this strain’s top-cropping nature, the flocculation is variable, and repeated cone cropping can affect the overall population and performance.

This strain is part of our Express Yeast line and is available for next day shipment!


This free downloadable resource contains a wealth of information that all BSI customers should have ready and accessible in their breweries.


  • A Yeast and Brewing Bacteria Quick Reference Chart with a list of strains, apparent attenuation, flocculation, and fermentation range.
  • A Quick Reference Table with Comparable Strains.
  • A page-by-page list of BSI’s yeast and brewing bacteria strains with descriptions and key specs.
  • A comprehensive list of BSI cultures organized by the type of beer you want to brew, from ales to lagers to regional varieties like Belgian and German.
  • …and MORE!