🧬 NAD: The Molecule of Life — and the HypeHow a lab coenzyme became the latest anti-aging obsession
What We Mean by Longevity and Healthspan

When people talk about longevity, they usually mean how long we live.

But healthspan — the years we live well — matters far more.

That’s the time before disease steals our energy, mobility, and independence.

Modern medicine has already doubled our lifespan in the last century.

Now the goal is to extend the healthy part — without falling for pseudoscience along the way.

When Marketing Meets Medicine

Longevity has become a booming business.

Some gurus, like Dr. Eric Topol, do real science.

Others, like Peter Attia, sell access: $150 000 per patient for lab tests, a VO₂ max treadmill run, and a few “optimized” workouts.

He’s also an investor in AG1 — the influencer’s green drink of choice.

Andrew Huberman promotes similar ideas under studio lights bright enough to sterilize a petri dish.

Both are clever, credentialed, and caught between data and drama.

Then there’s Dr. David Sinclair, who helped discover how cells age — and then helped turn that discovery into a supplement empire.

His company tried to patent NMN, an NAD precursor, as a drug.

The FDA briefly removed NMN from the supplement market, sending Reddit into meltdown.

It’s back now, but the episode showed how quickly science slides into sales.

And finally, we have the shirtless salesmen:

Paul Saladino, who went from carnivore crusader to “fruit influencer.”

Liver King, whose real secret wasn’t liver — it was injectable.

And Gary Brecka, who claims to predict your death date (for a fee).

These are subscription services disguised as sages.

What NAD Actually Is

Nicotinamide adenine dinucleotide (NAD⁺) is a molecule found in every living cell.

It helps convert food into energy and repair DNA.

As we age, NAD levels fall — metabolism slows and damage builds up.

So scientists asked: If we raise NAD again, can we slow aging?

In mice, the answer looks promising.

NAD precursors like nicotinamide riboside (NR) and nicotinamide mononucleotide (NMN) increase average lifespan by 5–15 percent and improve energy, insulin sensitivity, and activity.

That’s great for mice — but we don’t live in cages or eat lab chow.

Can You Get NAD from Food?

Not directly — but your body makes NAD from dietary precursors:

tryptophan and niacin (vitamin B₃).

You’ll find them in fish, poultry, beans, milk, and whole grains — basically, a Mediterranean-style diet.

So before spending $90 on capsules, you can spend $9 at the farmers' market.

What the Human Studies Show

Human trials of NR or NMN (usually 500–2000 mg per day for 6–12 weeks) show they are safe and well-tolerated.

They modestly raise NAD levels and sometimes improve lipid profiles and blood pressure.

But the effects are small and inconsistent, especially in healthy adults.

NAD precursors do not reverse aging.

They don’t prevent heart attacks or extend lifespan in people — at least, not yet.

NAD vs Statins: A Reality Check

Meta-analyses show NAD precursors, especially niacin, can lower LDL (“bad”) cholesterol by about 8–12 percent.

That’s fine, but compare it to rosuvastatin (Crestor):

DoseAverage LDL Reduction5 mg≈ 45 %10 mg≈ 52 %20 mg≈ 55 %40 mg≈ 63 %

That’s the difference between “interesting biochemistry” and “fewer funerals.”

So NAD may nudge your cholesterol; statins save lives.

Who Might Benefit

Older adults with metabolic syndrome, prediabetes, or early neurodegenerative disease could see modest improvements in inflammation or blood lipids.

Younger, healthier people mostly see lighter wallets.

No serious drug interactions have been documented, though theoretical ones exist with some chemotherapy or DNA-repair drugs.

As always, talk to your doctor before combining anything with prescription therapy.

Food Before Pharma

The best way to support NAD and longevity is still food, sleep, and movement.

A Mediterranean diet rich in legumes, vegetables, olive oil, and fish fuels NAD pathways naturally — and has proven benefits for heart and brain health.

No influencer code required.

A Note from the Galley

We’ll explore all of this — diet, longevity, and a little wine science — on next summer’s Mediterranean Longevity Cruise.

World-class physicians, scientists, and chefs will join me for ten days of evidence-based indulgence.

It’ll cost less than a Peter Attia consult — and no one will force you to drink AG1.

(For the record, I still do. It’s gentle on my stomach, but I’m hunting for less bougie vitamins.)

The Takeaway

Boosting NAD may someday help extend healthspan, but for now, the best evidence still supports:

• Eat Mediterranean-style food.
• Move daily.
• Sleep enough.
• Manage stress.
• See your doctor before your supplement dealer.

That’s how you live longer and better — no silver bullet, just science and common sense.

References

Effects of NAD+ Precursor Supplementation on Glucose and Lipid Metabolism in Humans: A Meta-Analysis. Zhong O, Wang J, Tan Y, Lei X, Tang Z. Nutrition & Metabolism. 2022;19(1):20. doi:10.1186/s12986-022-00653-9.

2 Niacin: An Old Lipid Drug in a New NAD+ Dress. Romani M, Hofer DC, Katsyuba E, Auwerx J. Journal of Lipid Research. 2019;60(4):741-746. doi:10.1194/jlr.S092007.

3.Nicotinamide Adenine Dinucleotide in Aging Biology: Potential Applications and Many Unknowns. Bhasin S, Seals D, Migaud M, Musi N, Baur JA. Endocrine Reviews. 2023;44(6):1047-1073. doi:10.1210/endrev/bnad019.

4. Crestor. FDA Drug Label. Food and Drug Administration Updated date: 2024-07-31