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
Korean alcoholic drinks are six distinct flavors: sweet, sour, pungent, roasted, bitter and spicy. When the flavors are balanced, the alcohol is considered good quality. Most traditional Korean alcoholic drinks are rice wines, fermented with the aid of yeast and "nuruk" (a wheat-based source of the enzyme amylase). Main varieties include clear rice wines ("cheongju"), milky rice wine ("takju"), distilled liquor ("soju"), fruit wine ("gwasil-ju"), flower wines, and medicinal wines. "Makgeolli" (also known as "takju" and "nongju"), is a milky, sweet alcoholic drink made from rice. It is one of Korea's most-popular alcoholic drinks. The oldest traditional Korean rice wine, its alcohol content