ChromaDexNiagen Bioscience (formerly ChromaDex) is a NAD+-science company focused on advancing cellular health and aging research, with a mission to improve healthspan by restoring and optimizing NAD+ levels. It offers NAD+-enhancement products like Tru Niagen and Niagen Plus, backed by hundreds of clinical studies, patents, and collaborations with researchers. The company cites clinical data showing NR increases NAD+ and is associated with improvements in sleep, mood, and fatigue, including in long COVID populations.