Catalase is an enzyme found in many living organisms, including humans, plants, and bacteria. Its primary function is to break down hydrogen peroxide, a harmful byproduct of cellular metabolism, into water and oxygen. This reaction helps protect cells from oxidative damage. Catalase is particularly abundant in the liver and is crucial for maintaining cellular health. The enzyme works quickly, allowing it to convert millions of hydrogen peroxide molecules every second. This efficiency makes catalase an essential component of the body's defense against oxidative stress and contributes to overall metabolic processes.