Alcoholic drink which contains a very high level of alcohol and "does not contain any added flavoring" is commonly called a neutral spirit. Generally, any distilled alcoholic beverage of 170 US proof or higher is considered to be a neutral spirit. Most yeasts cannot reproduce when the concentration of alcohol is higher than about 18%, so that is the practical limit for the strength of fermented drinks such as wine, beer, and sake. However, some strains of yeast have been developed that can reproduce in solutions of up to 25% ABV. Shot sizes vary significantly from country to country. In the United
Caffeinated alcoholic drink blend caffeine and alcohol but wanted to cooperate with regulators. The FDA continues work with Phusion Projects and other manufacturers to assure their products meet safety standards. In Canada, regulations restrict the manufacture and sale of caffeinated alcoholic drinks unless the caffeine comes from natural sources such as guarana; manufactured caffeine cannot be directly poured into an alcoholic drink. In Mexico, caffeinated alcoholic drinks cannot be sold in bars or nightclubs. In Australia, the Ministerial Council on Drug Strategy is considering regulation to address the growing concerns over the drinks. The government of New South Wales is looking to ban