Alcohol dehydrogenase is an enzyme found primarily in the liver that helps break down alcohol in the body. It converts ethanol, the type of alcohol found in beverages, into acetaldehyde, a toxic compound. This process is essential for metabolizing alcohol and reducing its effects on the body. The enzyme plays a crucial role in the body's ability to handle alcohol consumption. Different individuals may have varying levels of alcohol dehydrogenase, which can influence their tolerance to alcohol and susceptibility to alcohol-related health issues.