There are at least 100 components in hop polyphenols. The properties of these substances are important for beer. Certain polyphenols protect the beer from oxidation, others are thought to be responsible for the cloudiness of the beer after long storage. Brewers are therefore not so happy about the presence of large quantities of polyphenols in their beer. Most polyphenols are therefore removed during the production process. This procedure guarantees a longer shelf-life.