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Neither companies have been involved in this research, however

IP administration creates rapid systemic spikes and clearance, triggering acute stress-response pathways

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Inhibitors of NAD+ biosynthesis, particularly those targeting nicotinamide phosphoribosyltransferase (NAMPT), have shown potential in preclinical models, although resistance mechanisms such as alternative NAD+ biosynthetic pathways can limit their effectiveness

The agency cited immunogenicity risks (peptides can trigger anti-drug antibodies with repeated injection), manufacturing impurity concerns (endotoxin contamination, truncated sequences, diastereomers), and the absence of robust human clinical data for most compounds