While brewers and bottlers use yeast to ferment alcoholic drinks during the manufacturing process, some types of alcohol that undergo rigorous filtration to remove yeast include vodka, bourbon and rum. Gin, filtered wine, distilled liquor and filtered beer are others.
In the United States, the law requires manufacturers to pasteurize and filter alcoholic beverages prior to bottling them. For this reason, domestic brands such as Captain Morgan and Budweiser are safe for people with yeast sensitivity. However, when buying imported liquors and other spirits from places such as the Czech Republic or Russia, there is no guarantee that the manufacturer used the same filtration and pasteurization processes required by domestic bottlers.