Lactic Acid is a biomarker that holds potential for longevity research. Elevated levels of lactic acid in the body indicate an increased reliance on anaerobic metabolism, which may be linked to poor mitochondrial function and inefficient energy production. Monitoring lactic acid levels can provide insights into cellular aging and overall metabolic health, allowing for the identification of individuals at higher risk for age-related diseases. Additionally, lactic acid can serve as a useful indicator of exercise tolerance and physical fitness, which are key determinants of longevity. By understanding and leveraging lactic acid as a biomarker, researchers can gain valuable insights into the aging process and potentially develop targeted interventions to promote healthy aging.