Nicotinamide adenine dinucleotide (NAD⁺) is a central and indispensable molecule that has been preserved in nearly every cell, from bacteria to humans[1]. It functions as a coenzyme in redox reactions, a substrate for various enzymes, a key player in cellular metabolism, and a signaling molecule.  The fact that NAD⁺ is involved in virtually every critical … Continue reading NAD⁺: A universal molecule