Alcohol. According to Wine.com, alcohol-free beer is not completely free of alcohol, but contains a small amount of alcohol, and its alcohol content is generally lower than 0.5%, which is also called non-drunk beer. Most of the alcohol was removed and the taste of beer remained. Ordinary beer generally has an alcohol content of 3.5%-4%, and those with an alcohol content above 0.5% and below 2.5% are called low-alcohol beer, and those with an alcohol content below 0.5% are called alcohol-free beer.