What is the recommended range for magnesium in brewing water?

The recommended range for magnesium in brewing water is between 5 and 40 parts per million (ppm). Magnesium plays several important roles in the brewing process, particularly in yeast metabolism and enzyme function, which are crucial for efficient fermentation and flavor development.

At levels between 5-40 ppm, magnesium contributes positively to the overall quality of the beer. It helps in the stabilization of certain proteins, can enhance the perceived fullness and mouthfeel of the beer, and acts as a cofactor for several enzymes that are vital in both the mashing and fermentation stages. Magnesium also aids in the development of the yeast health, promoting higher fermentation performance.

Concentrations lower than 5 ppm may not provide these beneficial effects adequately, while levels surpassing 40 ppm can lead to undesirable flavors or astringency in the finished beer. Therefore, the middle range of 5-40 ppm is considered optimal for achieving the desired balance of effects on both brewing performance and flavor profile.