What does oxidation do to beer?

Oxidation in beer is a chemical reaction that occurs when beer is exposed to oxygen over time. This process typically leads to the development of stale flavors, which can be unappealing to drinkers. Common characteristics of oxidized beer can include notes reminiscent of paper, cardboard, or sherry-like qualities. As beer ages and continues to oxidize, its fresh hop aromas and flavors can diminish, contributing to a less vibrant and more muted drinking experience.

In contrast, some choices might suggest effects such as improvement of flavor or aroma enhancement, which are typically not associated with oxidation in beer. While slight oxidation can sometimes contribute complex flavors in certain aged or barrel-aged beers, this is not the norm for most traditional beer styles; therefore, it isn't seen as a general benefit. It's essential for brewers and beer servers to understand the impact of oxidation to maintain the quality and freshness of the beer they serve.