NAD+ (nicotinamide adenine dinucleotide) functions as a critical coenzyme in cellular metabolism, playing an essential role in energy production within every cell of the body. At the cellular level, NAD+ participates in redox reactions, serving as an electron carrier that facilitates the conversion of nutrients into adenosine triphosphate (ATP), the primary energy currency of cells. This process occurs primarily within the mitochondria during cellular respiration, where NAD+ helps break down glucose, fats, and other substrates to generate the energy needed for basic cellular functions. Additionally, NAD+ serves as a substrate for various enzymes involved in DNA repair, gene expression regulation, and cellular signaling pathways that support overall cellular health and function. Research indicates that NAD+ levels naturally decline with age, potentially affecting these vital cellular processes. The body can synthesize NAD+ through multiple pathways, including conversion from dietary precursors like niacin (vitamin B3) and tryptophan. When NAD+ supplementation through medications is considered, the goal is typically to support these natural cellular processes.
