NAD therapy is a treatment designed to deliver or increase nicotinamide adenine dinucleotide, better known as NAD+. Most of the time, NAD therapy refers to NAD+ given directly into a vein through an IV infusion.

NAD+ itself is not a wellness fad. Your cells rely on it for energy metabolism and many other biological processes. The bigger question is what happens when extra NAD+ is given as a treatment. Here, the science is much thinner.

Human studies have examined how IV NAD+ is metabolized and tolerated, but there is not yet strong clinical evidence that NAD therapy slows aging, improves longevity, or treats specific diseases. (1)(2)

Key Takeaways:

• NAD therapy most commonly means NAD+ delivered through an IV infusion.
• NAD+ plays important roles in energy metabolism, cellular signaling, and DNA-related processes.
• Small human studies confirm that IV NAD+ affects NAD metabolism, but they do not prove broad anti-aging or health benefits. (1)
• NAD IV therapy can cause uncomfortable infusion-related symptoms, and the FDA has raised concerns about the quality of some compounded NAD+ injectables. (2)(3)

What Is NAD+?

NAD+ stands for nicotinamide adenine dinucleotide. It is a coenzyme found throughout the body.

One of its main jobs is helping transfer electrons during reactions that turn nutrients into usable cellular energy. NAD+ also serves as a substrate for enzymes involved in cell signaling, DNA damage responses, and other maintenance processes.

You may also see NADH mentioned. NAD+ and NADH are two forms of the same molecule that cycle back and forth during metabolic reactions. So, while people casually use "NAD" as a catch-all term, NAD+ and NADH are not exactly the same thing.

What Is NAD Therapy?

The term NAD therapy can describe several approaches aimed at increasing NAD+ availability.

These include:

• NAD+ IV infusions
• NAD+ injections
• NAD+ nasal products
• Oral NAD precursors such as NMN and nicotinamide riboside, or NR

When clinics advertise "NAD treatment," they are generally referring to an intravenous NAD+ infusion.

During treatment, NAD+ is diluted into an IV solution and slowly infused into a vein. Sessions may last from around one hour to several hours, depending on the dose, infusion rate, and how well the person tolerates it. (1)(2)

Importantly, getting NAD+ through an IV does not mean the molecule simply travels unchanged from the IV bag straight into your cells.

How Does NAD IV Therapy Work?

IV treatment bypasses the digestive system and introduces NAD+ directly into the bloodstream. What happens next is more interesting than many clinic descriptions suggest.

In a small 2019 study, eight healthy men received NAD+ continuously for six hours at a rate of 3 micromoles per minute, while three participants received saline.

Researchers found no significant rise in plasma NAD+ or several measured NAD metabolites during the first two hours. They concluded that infused NAD+ was being rapidly removed from the plasma during that period. (1)

By the end of the infusion, researchers also found increased urinary excretion of NAD+ and methyl nicotinamide. (1)

This matters because the common explanation that an NAD drip simply "floods your cells with NAD+" leaves out a big part of the story. The body metabolizes infused NAD+, and researchers are still working out how this translates into meaningful health effects.

What Is NAD Therapy Used For?

NAD clinics promote IV treatments for a wide mix of goals, including:

• Low energy and fatigue
• Mental clarity
• Exercise recovery
• Healthy aging
• General wellness
• Alcohol or drug withdrawal support

There is a big difference, though, between a treatment being marketed for something and clinical trials showing that it works.

NAD+ biology provides good reasons for researchers to study these areas. It does not, by itself, prove that an NAD infusion improves them.

For example, NAD therapy has been promoted for addiction recovery and withdrawal for decades. However, there still is not enough high-quality clinical evidence to establish NAD therapy as a proven treatment for substance use disorders. (4)

Does NAD Therapy Work?

One of the most cited human IV NAD+ studies from 2019 included only eight people receiving NAD+. Its goal was to investigate what happened to NAD+ and its metabolites during an infusion, not to test anti-aging, energy, cognitive, or longevity outcomes. (1)

More recent research has also highlighted how little clinical data we have.

A 2026 retrospective study examined six people who received 500 mg of IV NAD+ for four consecutive days and eight who received the same dose of IV nicotinamide riboside. Researchers followed participants for 30 days.

They found no significant changes in several measured markers, including fasting glucose, hsCRP, creatinine, or thyroid-stimulating hormone in the NAD+ group.

The researchers called for larger randomized and placebo-controlled studies before conclusions can be made about effectiveness. (2)

So far, good clinical trials have not established that IV NAD therapy:

• Extends human lifespan
• Reverses aging
• Prevents age-related disease
• Reliably improves energy or cognition
• Treats addiction on its own

That does not mean researchers will never find useful applications. It simply means the marketing has moved faster than the evidence.

NAD IV Therapy vs NMN and NR

NAD+ is a large molecule, while NMN and NR are precursors, meaning the body can use them as raw materials to make NAD+.

The main mistake is assuming an IV must work better simply because it goes directly into the bloodstream.

A 2026 real-world study found noticeable tolerability differences between IV NAD+ and IV NR. All six people receiving NAD+ reported moderate to severe symptoms during treatment, while symptoms in the NR group were generally milder. (2)

That study was very small and cannot tell us which approach offers better long-term health outcomes.

What Happens During NAD IV Treatment?

Before treatment, a clinic may review your medical history, medications, and health goals.

A healthcare professional then places an IV catheter into a vein and administers diluted NAD+ gradually. The infusion rate can matter because faster administration may make side effects harder to tolerate.

There is no single research-backed NAD IV dose or treatment schedule that has been established for general wellness or anti-aging purposes.

Commercial protocols can vary considerably, which is another reason results from one clinic or treatment plan cannot automatically be applied to another.

Is NAD Therapy Safe?

Human safety data on repeated or long-term NAD IV treatment are still limited.

In the 2026 study mentioned earlier, all six participants receiving NAD+ reported symptoms including some combination of abdominal cramping, nausea, vomiting, diarrhea, increased heart rate, throat discomfort, congestion, and chest pressure during infusion. The reported symptoms stopped after the infusion ended. (2)

Product quality matters too. The FDA has warned about compounders using food-grade NAD+ to prepare sterile injectable products. Food-grade ingredients may contain microbes or endotoxins that make them unsuitable for injections without appropriate processing.

The agency has received reports following injectable NAD+ use involving severe chills, shaking, vomiting, and fatigue, with some patients needing medical treatment. (3)

A separate FDA warning letter published in 2026 described three patients who developed symptoms including low blood pressure, uncontrollable shaking, chills, and body aches after receiving a compounded product containing NAD+. Testing later found excessive bacterial endotoxins in an unopened vial from the same lot. (5)

That does not mean every NAD infusion carries the same contamination risk. It does show why the source and preparation of an injectable product matter.

Final Words

NAD+ deserves the attention it gets from researchers. It sits at the center of cellular energy metabolism and several processes linked with aging.

NAD therapy is a different question. Giving NAD+ through an IV may sound like the most direct approach, but human research is still small, and many of the health claims surrounding NAD drips have not been demonstrated in strong clinical trials.

For people interested in supporting NAD+ without spending hours connected to an IV, researchers are also studying oral NAD precursors.

At Omre, we formulated our NMN + Resveratrol supplement as a simple daily option for people interested in supporting healthy aging and cellular health without making unrealistic promises about what a supplement can do.

FAQs

What is NAD therapy?

NAD therapy is a treatment intended to deliver or increase nicotinamide adenine dinucleotide, or NAD+. The term most commonly refers to NAD+ given through an intravenous infusion.

What does NAD treatment do?

NAD treatment delivers NAD+ into the bloodstream, where it can be metabolized into NAD-related compounds. While NAD+ plays many important roles in cells, researchers have not yet established that IV NAD+ produces broad anti-aging or wellness benefits in humans. (1)

How long does NAD IV therapy take?

Infusion time varies by dose, protocol, and tolerance. Published studies have used sessions ranging from around one to several hours, including one pharmacokinetic study that infused NAD+ continuously for six hours. (1)(2)

Is NAD therapy FDA approved?

NAD+ IV therapy is not an FDA-approved treatment for aging, longevity, fatigue, addiction, or other commonly marketed wellness uses. The FDA has also issued safety communications related to inappropriate ingredients used in some compounded NAD+ injections. (3)

Is NAD IV therapy better than NMN or NR?

There is not enough evidence to say that IV NAD+ provides better health outcomes than NMN or NR. These approaches work differently, and direct comparisons in humans remain very limited.

References

1. Grant R, et al. (2019). A Pilot Study Investigating Changes in the Human Plasma and Urine NAD+ Metabolome During a 6 Hour Intravenous Infusion of NAD+. Frontiers in Aging Neuroscience.

2. Reyna K, et al. (2026). Intravenous infusion of nicotinamide adenine dinucleotide (NAD+) versus nicotinamide riboside (NR): a retrospective tolerability pilot study in a real-world setting. Frontiers in Aging.

3. U.S. Food and Drug Administration. FDA reminds compounders to use ingredients suitable for sterile compounding.

4. WebMD. NAD Therapy for Addiction: What to Know. Medically reviewed May 20, 2026.

5. U.S. Food and Drug Administration. GenoGenix LLC Warning Letter. January 20, 2026.