Your cells already have a busy day
NAD+ is a coenzyme, a small helper for the proteins that do chemical work in cells. It helps cells turn food into usable energy and supports jobs such as DNA repair. Cells make it and recycle its ingredients. The biology is fascinating, even without an anti-aging promise attached.a
That makes the heart worth studying too. But having an important job doesn't mean adding more improves it. Our heart essay explores that gap.
NR and NMN help make NAD+; they aren't NAD+ itself
A precursor to NAD+ is an ingredient the body can use to make it. NR, short for nicotinamide riboside, and NMN, nicotinamide mononucleotide, are two of those ingredients. Their similar names can hide different results.
Oral NR has raised NAD+ in whole blood in a controlled trial. That's a real change, but it doesn't tell us whether someone had more energy for their day. The NR and NMN comparison explains what the studies actually found.b
An injection still needs a useful outcome
A small NAD+ infusion study tracked blood and urine chemistry. It wasn't a test of lasting relief from fatigue or a longer life. Getting a molecule into a vein answers a delivery question; feeling better is another matter.
There are risks too. NAD+ infusions have been associated with nausea, flushing and chest or abdominal discomfort. A compounded NAD+ injection was recalled for high levels of endotoxin, material from bacteria that can cause harmful reactions. The injection essay covers those concerns and what prescription review involves.
We'd want a benefit you could recognise: perhaps an activity getting easier, with a fair comparison and an account of harms. A bigger blood-test number can still leave that question open.