Energy drink that can be taken in one swallow (or "shot"), as opposed to energy drinks that encourage users to drink an entire can, which may contain 250 calories or more. Energy drinks such as Red Bull are often used as mixers with alcoholic drinks, producing mixed drinks such as Vodka Red Bull which are similar to but stronger than rum and coke with respect to the amount of caffeine that they contain. Sometimes this is configured as a bomb shot, such as the Jägerbomb or the "F-Bomb" Fireball Cinnamon Whisky and Red Bull. Caffeinated alcoholic drinks are also sold in some
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