Lifespan Lifespan is the timeframe in which a person, animal, or other living organism functions. Random Glossary Term NMN (Nicotinamide Mononucleotide) Nicotinamide Mononucleotide (NMN) has become a popular molecule in the field of health and longevity research. As a precursor to... Sign Up For Our Newsletter Weekly insights into the future of longevity Sign Up