Your NAD+ Went Up. Your Body Didn't Notice.

Want to give your cells' NAD+ machinery a tune-up? Lift something, then go for a walk. In a 12-week study, both strength and cardio training rebuilt a key NAD+-recycling enzyme in older adults' muscles.

That's the free version. Now let's talk about the version people pay for.

If you've spent any time on the longevity internet, you've seen NAD+ sold as the anti-aging molecule. Pills, powders, nasal sprays, two-hour IV drips. Here's what the research actually says.

Wait, what is NAD+?

It's a helper molecule every one of your cells uses to turn food into energy and keep its repair crews working. It isn't a peptide. It's a coenzyme, closer to a vitamin cousin than a hormone.

Think of it like your phone's battery charge. In a lot of animal studies, the charge runs lower with age. So the pitch writes itself: top up the battery, slow the clock.

Plot twist: a September 2026 review points to big human datasets suggesting blood NAD+ may not drop much with healthy aging at all. The battery may not be as drained as the ads say.

So where does exercise come in?

Your muscles mostly recycle NAD+ rather than making it from scratch, and one enzyme runs that recycling line. In a 2019 study from Copenhagen and US labs, 12 weeks of either cardio or strength training raised that enzyme in older adults' muscles by roughly 30%.

To be fair, they measured an enzyme, not lifespan. But exercise brings plenty of other well-documented perks, so you're not betting much.

Mix it up. Both cardio and strength training moved the needle in that study.

Show up consistently. The changes came from weeks of regular training, not one heroic gym day.

Do the pills actually work?

They charge the battery. That part is now pretty solid.

In a University of Tokyo trial published in September, adults 65 and older took a high-dose NMN pill or a dummy pill every day for six months. Their blood NAD+ clearly went up. Their hearing, the main thing being tested, didn't improve. Neither did physical performance.

The NMN maker funded that trial and supplied the pills. It still came up empty, which makes the null result more believable, not less.

A University of Delaware trial this summer gave older adults with mild memory problems another precursor, NR, for 12 weeks. Blood NAD+ doubled. Memory scores didn't budge.

The battery icon went green. The phone didn't get any faster.

Zoom out and the pattern holds. An April 2026 review of 33 human studies found the pills reliably raise NAD markers and are generally well tolerated. Effects on actual health and function were mixed and often zero.

What about the IV drips?

This is the fancy clinic version, and it has the thinnest file. That same review found no outcome trials at all testing IV NAD+ for aging or wellness.

What does exist is small. In a 2019 pilot, infused NAD+ seemed to vanish from the blood for the first two hours, broken down almost as fast as it went in.

And a 2026 chart review from a wellness clinic found that all six people getting NAD+ drips reported side effects during the infusion, like cramping, nausea, and chest pressure. That's not a spa vibe.

Literature, not lore.

So is NAD+ all hype?

Not quite. The biology is real, and the mouse studies are genuinely interesting: a year of NMN helped aging mice keep better energy metabolism and activity.

The human question is still open, and serious people are working on it. A Norwegian trial is giving 100 frail older adults NR or a placebo for a full year and tracking walking speed, with main results expected around the end of 2027.

So the honest grade is this: NAD+ boosters raise the number, and nobody has shown yet that the number changes how you age.

If you remember one thing…

Charging the battery isn't the same as upgrading the phone. Right now, the NAD+ habit with the best overall track record comes with sneakers, not a drip bag.

Everything Inspired Labs carries is for Research Use Only. It's lab material, not for your body, and nothing here is medical advice.