AA-400 is a thermo-stable alpha amylase enzyme that converts starch into dextrins during the cook process. For best results, it is added at the beginning of cook (when grains are added) at temperatures ranging from 170-190F. In addition to starch digestion, this enzyme also reduces viscosity, making it easier to achieve high gravity mashes. Use in combination with our GA-150 (added during fermentation) for optimized conversion and yields. For use in mashes with or without malted grains.