ALT (Alanine Aminotransferase) is a crucial biomarker used in assessing longevity. It is primarily found in the liver and is responsible for breaking down proteins to provide energy for the body. High levels of ALT in the bloodstream may indicate liver damage, which can impact overall health and longevity. Monitoring ALT levels can help identify potential liver issues early on, allowing for necessary interventions to prolong and improve quality of life. Incorporating ALT testing into longevity assessments provides valuable insights into liver function and overall well-being, contributing to a proactive approach to maintaining health and promoting longevity.