What Is NAD+, and What Can an NAD+ IV Realistically Do?

NAD+ drips are everywhere right now, with social media posts promising energy, focus, and younger cells. Patients ask us about them every week. We offer NAD+ infusions in our IV Lounge. So I want to be clear about what the molecule does, what the research shows, and where the evidence stops.

What NAD+ actually is

NAD+ stands for nicotinamide adenine dinucleotide. Your body makes it from niacin (vitamin B3) and, to a smaller degree, from the amino acid tryptophan. Every tissue converts niacin into NAD, and the National Institutes of Health counts more than 400 enzymes that need it.

Most of those jobs involve energy. NAD+ carries electrons in the reactions that move energy from carbohydrates, fats, and protein into ATP. It is also consumed by enzymes that maintain the genome: PARPs, which help repair damaged DNA, and sirtuins, which influence inflammation and energy metabolism. An enzyme called CD38 breaks it down.

Cells also constantly rebuild NAD+ from nicotinamide, and most Americans already get more niacin than recommended from food. Keep that in mind when you see the word "boost."

Does NAD+ really fall with age?

The claim behind every NAD+ product is that levels drop as we get older. The human evidence is thinner and more mixed than the advertising suggests.

The study most often cited measured NAD+ in skin removed during surgery from 49 people, from newborns to age 77. NAD+ was lower in older tissue in both men (r = −0.706) and women (r = −0.537). PARP activity, which consumes NAD+, rose with age in men, although the link was not significant once newborns were excluded. The authors proposed that DNA damage drives PARP to burn through NAD+. They also noted that the benefit of raising NAD+ "is yet to be established," and a small cross-sectional study cannot prove cause and effect.

In 2026 a much larger analysis in Nature Metabolism complicated the picture. Researchers measured whole-blood NAD+ across seven independent human cohorts. Levels remained "remarkably stable with age and across lifestyle interventions." Blood NAD+ did respond to nicotinamide riboside supplementation, as expected. The authors concluded that blood NAD+ may not be a useful biomarker of aging.

So NAD+ may decline in some tissues with age. But a blood test cannot tell you whether you are "low," and measuring NAD+ inside muscle or brain takes research tools, not a clinic visit. Any clinic offering to check your level and top it up is claiming more precision than the science allows.

What the research on NAD+ boosters shows

A 2020 systematic review in the journal Pharmaceuticals found 36 published human trials. Half used oral precursors such as nicotinamide, nicotinamide riboside (NR), or nicotinamide mononucleotide (NMN), the forms sold as supplements. Seventeen trials reported some benefit, twelve reported none, and seven measured only blood levels or safety. NAD+ rose in all eleven trials that measured it, but the methods differed so much that the results were nearly impossible to compare.

The reviewers concluded that "promising, yet still speculative" results had been reported for just two uses, psoriasis and skeletal muscle performance, and that further trials are needed. They added a point I agree with: NAD+-boosting approaches should be compared head-to-head with exercise and dietary programs tailored to older adults, which "may be more effective."

What we know about NAD+ given by IV

The best data on what happens after an infusion come from a 2019 pilot study in Frontiers in Aging Neuroscience. Eleven healthy men aged 30 to 55 took part: eight received 750 mg of NAD+ over six hours and three received saline. Plasma NAD+ did not rise at all during the first two hours; the authors described it as rapidly and completely removed from the plasma. Levels climbed later, reaching 398% above baseline at six hours, while urinary excretion of NAD+ jumped 538%. No adverse events occurred at that slow rate. The study was tiny and partly funded by a company connected to NAD+ clinics. It shows how the body handles an infusion, not whether anyone felt better.

A 2026 report in Frontiers in Aging looked at tolerability in the real world. It reviewed 14 clients at a commercial wellness clinic who received four daily infusions of 500 mg of NAD+ or NR, controlling their own drip rate. All six NAD+ clients reported moderate to severe cramping, diarrhea, nausea, vomiting, a faster heart rate, throat pain, congestion, and chest pressure during the drip. They slowed their infusions to cope, averaging 97 minutes versus 37 for NR. Every symptom "ceased immediately upon infusion completion." There was no placebo group, and the clinic funded the work and employed most of its authors.

That is the state of the evidence in healthy adults: we know how IV NAD+ is cleared and how it feels going in. We do not have a controlled trial showing that infusions improve energy, focus, recovery, or any measure of aging. The 2020 review noted that how the body handles infused NAD+ "is currently unclear," though the liver likely splits it into nicotinamide and ADP-ribose, as shown in mice. In other words, much of an infusion may end up as ordinary vitamin B3.

A safety warning worth knowing about

In October 2024 the FDA reminded compounders to use only ingredients suitable for sterile drugs. Some had been making IV products from food-grade NAD+ sold by repackagers. The FDA had received adverse event reports after NAD+ injections describing severe chills, shaking, vomiting, and fatigue, with some people requiring medical treatment. It called those reactions "consistent with excessive levels of endotoxins." Endotoxins are toxic fragments of bacteria that can contaminate ingredients never processed for sterile use.

The lesson: who makes the product matters as much as what it is. Ask any provider offering NAD+ which pharmacy prepared it and whether the ingredient was certified for sterile injection. If they cannot answer, treat that as a red flag.

What an NAD+ infusion visit is like at Reset You MD

Every infusion in our IV Lounge starts with a brief health screening. We review your medical history, medications, any pregnancy or breastfeeding, and how you have tolerated infusions before. Some people should not receive NAD+, and we will tell you if that includes you.

If we proceed, a small IV is placed in your arm and the NAD+ runs slowly. Plan on one to three hours or more depending on the dose. A faster drip is what people in the published reports could not tolerate: cramping, nausea, a faster heartbeat, and chest pressure. Our team checks on you throughout and can slow or pause the drip the moment you feel unwell. Eat beforehand, arrive hydrated, and bring something to read.

We describe NAD+ as one optional piece of a broader plan built on sleep, nutrition, strength training, and, when labs call for it, hormone care. It is not a treatment for any disease, and we do not promise that it will make you feel younger or sharper. Some people report feeling well afterward; the studies cannot yet separate that from placebo, and individual experiences vary.

The bottom line

NAD+ is real biology with an unfinished evidence base. The age-related decline is less certain than advertised. Oral precursors raise blood levels without clear clinical benefit so far, and infusions have been studied for how they are handled and tolerated, not for what they do. If you are curious about NAD+, or have been offered it elsewhere, book a complimentary consultation. We will go through your goals and history and tell you plainly whether it belongs in your plan.

Website content is for general education and does not replace individualized medical advice, diagnosis, or treatment. Individual results vary. This article is general education from a Florida physician and does not create a doctor–patient relationship; talk with your own clinician about your situation.