Nicotinamide adenine dinucleotide (NAD+) is a coenzyme found in every living cell and is involved in several essential metabolic processes. Researchers are studying NAD+ for its potential involvement in DNA repair, cellular communication, and age-related cellular changes. It also plays a role in energy production. NAD+ levels can naturally decline over time, and some individuals explore peptide therapy to help maintain balanced levels. Research continues to explore its potential benefits for general well-being and cellular function.