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Not a peptide · dinucleotide coenzyme
Not approvedNot a peptide, a coenzyme, and one present in every cell you have. The biology is genuinely important. The case for injecting it is considerably weaker than the marketing suggests, and the oral precursors sit in a different regulatory position again.
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Schematic structure, not to scale. Beads represent amino acid residues along the backbone.
In theory, raising NAD+ is designed to restore cellular energy metabolism and the sirtuin and PARP enzymes that govern DNA repair and stress response, machinery that measurably declines with age. The underlying biology is first-rate and not in dispute, and oral precursors demonstrably raise NAD+ levels in humans. What remains open is whether raising the level produces the outcomes attached to it.
The detail, if you want it
Nicotinamide adenine dinucleotide is a coenzyme central to cellular redox reactions and to the function of sirtuins and PARP enzymes. It is not a peptide, despite appearing in peptide catalogues. Levels do decline with age, and that decline is a legitimate and active area of research.
Not FDA approved. Compounded intravenous NAD+ has drawn regulatory attention, and there is essentially no controlled trial evidence supporting the energy, cognition, or longevity claims made for IV administration. The molecule is also large and unstable, which raises real questions about how much intact NAD+ actually reaches cells versus being broken down and salvaged.
Nicotinamide riboside and nicotinamide mononucleotide are a separate question. Supplementation with precursors does measurably raise NAD+ levels in humans. That part is established. Whether raising those levels produces clinical benefit is much less clear, and outcome data remains thin. NMN specifically has its own regulatory history: FDA has taken the position that it is excluded from the dietary supplement definition because it was previously investigated as a drug.
That NAD+ is essential, that it declines with age, and that precursors raise it. What is not established is that raising it reverses ageing, restores energy, or delivers the outcomes commonly advertised. Those are extrapolations from mechanism, not trial results.
That is the question a consultation answers. A licensed physician reviews your situation and tells you what the evidence supports. Including when the honest answer is no.
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