A publication based on longitudinal and cross sectional data and led by researchers at the U.S. NIH’s National Institute on Aging published on June 5, 2025 in Science has stated that the impact of taurine supplementation at delaying aging or treating aging-related conditions is context-dependent, and that the circulating levels of taurine are impacted by factors unique to each individual rather than declining with age. To qualify taurine as a true marker of aging, it should change with age across diverse populations over time and ideally supported by longitudinal data.