NAD+ (Injectable): What the Evidence Actually Shows

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The short version

A coenzyme present in every cell, central to energy metabolism and DNA repair.
Levels decline with age, which is the basis for the longevity positioning.
Compounded injectable and IV forms are available with a prescription.
Human outcome evidence is thin, and much of the strongest data is for precursors rather than NAD+ itself.
IV infusion is frequently uncomfortable at speed. That is expected, not a reaction.

What it is

Nicotinamide adenine dinucleotide is not an exotic compound. It is a fundamental coenzyme involved in redox reactions across cellular metabolism, and in the activity of sirtuins and PARP enzymes involved in DNA repair. The observation that NAD+ levels fall with age is well established and genuinely interesting.

Where the evidence actually is

The strongest human data in this space is not for NAD+ itself but for its precursors, particularly nicotinamide riboside and nicotinamide mononucleotide, taken orally. Those trials reliably show that blood NAD+ levels can be raised.

What is much weaker is the next link: evidence that raising NAD+ produces the clinical outcomes people are seeking. Trials looking at functional endpoints have generally been small and mixed. Direct IV NAD+ has less controlled evidence than the oral precursors, not more, despite costing considerably more.

What to expect

IV NAD+ infusions commonly produce chest tightness, flushing, nausea and a general unpleasant sensation if run quickly. Slowing the infusion resolves it. This is a well known and expected effect rather than an allergic reaction, but nobody should experience it without being warned first.

What this will not do

It will not reverse aging. Raising a biomarker is not the same as changing an outcome.
It will not outperform oral precursors on the strength of published evidence.
It will not fix fatigue with a medical cause that has not been worked up.

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