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Published Research Data Quantified findings from peer-reviewed studies on NAD+ (Nicotinamide Adenine Dinucleotide) enzyme families that consume NAD+ as a co-substrate sirtuins, PARPs, and CD38/NAD-glycohydrolases Covarrubias et al., Nat Rev Mol Cell Biol 2021 NAD+-dependent sirtuins (SIRT17) regulating metabolism, DNA repair, and stress response Verdin, Science 2015 decline in tissue NAD+ levels reported between younger and older human subjects Massudi et al., PLoS One 2012 verified purity by HPLC analysis in every Stemcode batch with published COA Published Research Studies on NAD+ (Nicotinamide Adenine Dinucleotide) 2021 NAD+ metabolism and its roles in cellular processes during ageing Nat Rev Mol Cell Biol Review of NAD+ biosynthesis and consumption pathways and how their dysregulation contributes to age-related cellular and metabolic decline