NAD+ therapy: forms, prices and the human studies

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme that every cell uses to turn food into energy and to run enzymes involved in DNA repair. Longevity clinics sell it as an injection, an IV drip or a nasal spray, on the idea that topping up NAD+ restores energy and slows aging. The chemistry is real. The clinical evidence for the products being sold is thin: no randomized trial has tested NAD+ injections, drips or sprays for aging, energy or lifespan, and the human studies that exist mostly measure blood levels and tolerability.

This guide sets out what each form of NAD+ is, what the studies show, what it costs online as of October 2026, and where it stands legally.

Four ways to take NAD+, and what’s known about each

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Injections

Subcutaneous NAD+ is what most online clinics sell. PepScribe describes a small injection “on a daily or every-other-day schedule,” with supplies and dosing instructions in the kit. We found no published trial measuring what subcutaneous NAD+ does to NAD+ levels, energy, or any aging marker. The doses and schedules clinics use come from clinical habit, not trials.

IV infusions

Two small studies give the only direct human data on NAD+ itself. In a 2019 pilot, researchers infused 750 mg of NAD+ over 6 hours into 8 healthy men aged 30 to 55 (3 more got saline). Blood NAD+ didn’t rise at all for the first 2 hours: the body cleared it as fast as it went in. No adverse events were seen at that slow rate.

A 2026 retrospective review of a commercial clinic’s records compared four days of 500 mg IV NAD+ with IV nicotinamide riboside. All 6 people who got NAD+ reported moderate to severe stomach cramping, diarrhea, nausea or vomiting, a faster heart rate, or chest pressure during the drip, which stretched infusions to about 97 minutes on average, against 37 minutes for nicotinamide riboside. Symptoms ended when the drips did.

Nasal spray

Nasal NAD+ is offered mainly for people who would rather avoid needles. We found no published trial of NAD+ nasal spray, and none comparing it with injections.

Oral precursors

Most of the human research uses precursors the body converts into NAD+. In a randomized crossover trial of healthy middle-aged and older adults, 6 weeks of nicotinamide riboside was well tolerated and raised NAD+ metabolism. In a 10-week trial, NMN improved muscle insulin sensitivity in postmenopausal women with prediabetes who were overweight or obese. Neither trial tested aging or lifespan, and neither used the injections clinics sell.

What the evidence does and doesn’t show

The evidence supports three statements. NAD+ is essential to cell metabolism. Oral precursors raise NAD+ levels in people. IV NAD+ is cleared quickly and, given fast, causes unpleasant symptoms.

It doesn’t support the claims behind most marketing. There is no trial showing that NAD+ injections, drips or sprays improve energy, focus, recovery or how fast you age, and no trial of any NAD+ product measuring lifespan. Raising a level in the blood isn’t the same as changing an outcome a person would notice. Clinics’ own fine print tends to say so: Eden’s NAD+ page says people seek it for “subjective outcomes such as feeling more energized or focused,” and that NAD+ injections are not FDA-approved for treating any condition.

What NAD+ costs online

These are the NAD+ injection prices published by the clinics in our NAD+ rankings, read from each site on October 18, 2026.

Nasal spray costs $99 a month at PepScribe, $125 at AgelessRx and $199 every 4 weeks at Luvo Health, with single bottles at $83 at Mochi Health. See the NAD+ nasal spray rankings for the full list.

Three things move the real price. A required membership can double what you pay: at Eden, the $91 first-month NAD+ price comes to $130 with the $39 first-month membership, and the membership alone is $99 a month after that. First-month prices can be half the ongoing price, as at AgelessRx and Luvo Health. And a per-vial price means nothing until you know how long the vial lasts at your dose, which Mochi Health doesn’t state. PepScribe is the lowest all-in monthly price we found; see our PepScribe review.

Is NAD+ legal and FDA-approved?

NAD+ is not FDA-approved for any use, and there is no approved NAD+ drug to compare it with. It is legal for a licensed 503A pharmacy to compound it for an individual prescription because the FDA lists NAD in Category 1 of its 503A bulk substances list, most recently updated May 14, 2026. Under its interim policy, the FDA does not intend to act against pharmacies that compound a Category 1 substance if the ingredient comes from an FDA-registered manufacturer with a valid certificate of analysis and the other 503A conditions are met.

That is enforcement discretion, not approval. It could end if the FDA finalizes the list without NAD. One salt form, beta-NAD disodium salt trihydrate, sits in Category 3 and isn’t covered, so it’s fair to ask a pharmacy which form it uses. Compounded NAD+ isn’t reviewed by the FDA for safety, effectiveness or quality, and the FDA has told telehealth companies not to imply that compounded drugs are FDA-approved.

Side effects in brief

With no FDA label and no controlled trial, side-effect information comes from clinics and from the two IV studies. Clinics list injection-site redness or soreness, nausea, headache, flushing and cramping. AgelessRx says irritation where the injection goes in is the most commonly reported problem. Fast IV infusions cause the most trouble. We cover this in detail in NAD+ injection side effects and safety.

How to choose a clinic, if you go ahead

• Ask what the price is after the first month and whether a membership is billed on top.
• For per-vial prices, ask how many weeks one vial lasts at your prescribed dose.
• Check that a licensed clinician reviews your history before prescribing, and how to reach them afterward.
• Look for a named pharmacy. PepScribe names its pharmacies; most clinics don’t.
• Check for a plain statement that the product is compounded and not FDA-approved.
• Read the refund terms. Compounded medication usually can’t be returned once dispensed.

Our longevity clinic rankings score each clinic on these points, and the longevity hub covers the other treatments these clinics sell. For the drug facts and current prices in one place, see our NAD+ treatment page.

The bottom line

NAD+ matters to every cell, and oral precursors reliably raise it, but no trial has shown that NAD+ injections, drips or sprays make people feel better or age more slowly. If you try it, you are paying $99 to $224 a month (as of October 2026) for a compounded product with no FDA review and no long-term safety data. Talk it through with a licensed clinician, start with a clinic that states its full price and names its pharmacy, and judge it against what it does for you rather than what the marketing promises.