NAD+ (nicotinamide adenine dinucleotide) is not a peptide — it's a coenzyme found naturally in every cell of your body. It plays a central role in turning food into energy and keeping cells healthy, and levels tend to decline with age, which is why it's a major focus of research on metabolism and aging.

In research models, NAD+ has been studied for its role in mitochondrial (cellular energy) function, DNA repair, and metabolic signaling, as well as markers related to brain function, muscle endurance, and skin and tissue health.

Key Terms:

• Coenzyme: A helper molecule that many enzymes need in order to do their job.
• Mitochondria: The parts of a cell that turn food into usable energy.

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