Mercapturic acid, also known as N-acetyl-L-cysteine-S-conjugate, is a compound that plays a vital role in our body's detoxification process. This substance is an important metabolite, formed when various xenobiotics and toxins are processed and eliminated from the body. Although commonly referred to as mercapturic acid, it is often interchangeably referred to as N-acetyl-L-cysteine-S-conjugate due to its chemical structure. This compound acts as a critical marker in assessing exposure to certain harmful substances in humans. Moreover, it serves as an indicator for the effectiveness of detoxification processes within our systems. Hence, both names, mercapturic acid and N-acetyl-L-cysteine-S-conjugate, are used to describe this valuable compound in scientific research and medical literature.