Root beer, a member of the so-called small beers group, has been brewed in America since colonization times. These drinks, characterized by an ethyl alcohol content not exceeding 0.5% (often even non-alcoholic), do not adhere to a single recipe. Different producers use a variety of plant roots, tree bark, herbs, and spices. The non-alcoholic version of root beer is typically made from extracts or syrups with the addition of carbonated soda water. In its alcoholic variant, the extract is mixed with yeast for fermentation.