Acetaldehyde dehydrogenase is a metabolic enzyme secreted by the liver, and its expression in the body is determined by the acetaldehyde dehydrogenase gene in the body. The exact level of acetaldehyde dehydrogenase varies from person to person and cannot be supplemented through external sources. Acetaldehyde dehydrogenase is a peptide or protein-like substance, which can be digested by the digestive tract into ineffective small molecules after oral administration, and is not therapeutic. The main role of acetaldehyde dehydrogenase is to participate in the metabolism and decomposition of alcohol in the body. In normal people, alcohol can be metabolized to acetaldehyde in the liver after drinking, and acetaldehyde can be metabolized to non-toxic acetic acid by acetaldehyde dehydrogenase, and finally decomposed into carbon dioxide and water and excreted from the body. If the activity of acetaldehyde dehydrogenase is insufficient or the expression level in the body is low, it will further lead to a large accumulation of acetaldehyde in the body, resulting in symptoms of poisoning. Acetaldehyde dehydrogenase should not be supplemented blindly from outside sources. If you are deficient in acetaldehyde dehydrogenase, it is recommended that you seek medical help promptly.