NAD⁺ (Nicotinamide Adenine Dinucleotide, Oxidized Form) is a crucial coenzyme found in all living cells, playing a central role in redox reactions, energy metabolism, and cellular signaling. In research, NAD⁺ is widely used as a biochemical reagent to investigate oxidative pathways, enzyme catalysis, and cellular aging mechanisms. Its essential function in metabolic regulation and mitochondrial activity makes NAD⁺ a cornerstone compound in molecular biology, enzymology, and longevity studies. This high-purity lyophilized form is optimized for consistent results in in vitro and in vivo experimental models, providing a reliable standard for investigating the biochemical foundations of life.