Intranasal NAD+ Nasal Spray vs. NAD+ IV Therapy vs. Oral NMN/NR: Bioavailability, Cost, and Convenience Compared

There are three common ways to raise NAD+: an IV drip in a clinic, oral precursors such as NMN or NR that your body turns into NAD+, and an NAD+ nasal spray used at home. An IV puts a large dose straight into a vein over several hours under a prescriber's care. NMN and NR are capsules or powders you swallow every day. A spray like our NAD+ Nasal Spray delivers NAD+ itself, and it is absorbed through the lining of the nose instead of being swallowed like a capsule. This guide compares all three on how they get in, dose, time, cost and convenience, so you can pick the one that fits your routine.

Key Takeaways

• NAD+ levels tend to decline with age, which is why people look for ways to support them.
• IV therapy delivers 500 to 1,000 mg in one sitting, but it takes two to four hours, needs a prescription and typically costs about $450 to $600 a session.
• Oral NMN and NR are precursors. In human trials, daily NMN raised blood NAD+ over several weeks.
• An NAD+ nasal spray supplies NAD+ itself in seconds at home, with no needle or prescription, for $149 to $249 for 30 servings.
• Some people combine routes, for example an occasional IV with a daily spray or capsule at home.

Why the Route Matters for NAD+

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme your cells use to turn food into energy, to run DNA maintenance and to power the sirtuin enzymes involved in how cells respond to stress. Research in animals and people shows NAD+ levels tend to fall with age (Covarrubias et al., 2021). For a deeper look at the molecule itself, see our NAD+ ingredient guide.

NAD+ is a large molecule. When it is swallowed, it meets stomach acid, digestive enzymes and the liver before anything reaches the bloodstream. That is why most capsules on the market use smaller precursors instead, and why IV drips and nasal sprays exist: each takes a different path around the gut.

NAD+ IV Therapy: The Clinic Route

An NAD+ IV mixes NAD+ into a saline bag and drips it into a vein. Standard sessions use 500 mg, and higher-dose sessions use 750 to 1,000 mg. Because NAD+ has to be infused slowly, a session usually takes two to four hours. IV NAD+ is prepared by compounding pharmacies and given under a prescription (FDA).

Here is what the human studies of IV NAD+ show:

• In a 2019 pilot study, researchers infused NAD+ for six hours. Plasma NAD+ and its breakdown products did not change for the first two hours, which the authors read as NAD+ being rapidly cleared from the blood early in the infusion (Grant et al., 2019).
• In a 2024 placebo-controlled pilot (a preprint sponsored by a maker of an NAD+ precursor), a 500 mg IV raised blood NAD+ by about 2 percent at 24 hours and about 15 percent by day 14. Nausea, headache, stomach upset and muscle cramping were the most common experiences during the drip.

IV therapy suits people who want a large single dose under supervision and can set aside the time and budget. Our guide to NAD+ SubQ injections, IV infusions and intranasal routes covers the clinic side in more detail.

Oral NMN and NR: The Precursor Route

NMN (nicotinamide mononucleotide) and NR (nicotinamide riboside) are building blocks your cells convert into NAD+. They are taken by mouth every day, which makes them easy to keep up. In 80 healthy middle-aged adults, 300, 600 or 900 mg of NMN a day for 60 days raised blood NAD+ at days 30 and 60 compared with placebo (Yi et al., 2023). In 60 older adults, 250 mg a day for 12 weeks also raised blood NAD+ (Morifuji et al., 2024).

Because the body has to make the conversion itself, results depend on each person's own metabolism. If you want to compare the two precursors, read NMN vs NR and NMN vs NAD+: precursor or the molecule itself. Our Enhanced NMN capsules provide 750 mg of NMN with TMG, resveratrol, pterostilbene and vitamin B12 in every two-capsule serving.

NAD+ Nasal Spray: The At-Home Route

A nasal spray delivers NAD+ itself rather than a precursor. It is absorbed through the lining of the nose instead of being swallowed like a capsule. The nose is a well-studied route for delivering many compounds (Ulusoy et al., 2022). Learn more in our guide to nasal sprays and intranasal delivery.

Our NAD+ Nasal Spray contains just NAD+ and alkaline water, in three strengths: 35, 100 or 170 mg of NAD+ per two-spray serving, with 30 servings per bottle. It takes a few seconds, needs no appointment or prescription, and ships cold so it arrives in good condition. Use code SPRAY20 at checkout for 20% off NAD+ Nasal Spray.

Side by Side: Nasal Spray vs IV vs Oral NMN and NR

Which Route Fits You?

• Choose IV if you want a large single dose under medical supervision and have the time, budget and a prescriber.
• Choose oral NMN or NR if you prefer a capsule and want to support your body's own NAD+ production.
• Choose a nasal spray if you want NAD+ itself in a daily routine at home, with no needle, appointment or prescription.
• Combine them if it suits you. Some people keep a spray at home between IV sessions, or pair a morning spray with a precursor capsule. Our NAD+ nasal spray vs IV drip guide walks through a combined routine.

Frequently Asked Questions

What is the best way to take NAD+?

It depends on your goal. IV therapy gives the largest single dose under supervision, oral NMN or NR supports your body's own production, and a nasal spray delivers NAD+ itself at home in seconds. The best choice is usually the route you can keep up every day.

Is an NAD+ nasal spray as strong as an IV?

An IV delivers far more NAD+ in one sitting, 500 to 1,000 mg over several hours. A spray delivers 35 to 170 mg per serving and is designed for daily use rather than a single large dose.

Does oral NMN raise NAD+ levels?

Yes. In human trials, daily NMN at 250 to 900 mg raised blood NAD+ over 30 to 60 days or more compared with placebo.

How does an NAD+ nasal spray get into the body?

It is absorbed through the lining of the nose instead of being swallowed like a capsule. Use one spray in each nostril while gently inhaling, then tilt your head back slightly for one to two minutes.

Can I use an NAD+ nasal spray and NMN together?

Yes. They take different routes, so a precursor capsule and a nasal spray can sit in the same routine. Check with your healthcare provider if you take medication.

How much does NAD+ IV therapy cost compared with a spray?

A standard 500 mg IV session typically costs about $450 to $600. A 30-serving bottle of our NAD+ Nasal Spray costs $149 to $249, and code SPRAY20 takes 20% off.

Do I need a prescription for an NAD+ nasal spray?

No. Our NAD+ Nasal Spray needs no prescription. IV and injectable NAD+ are compounded and require a prescription.

This article is for education only and is not medical advice. Our products are not intended to diagnose, treat, cure or prevent any disease. Talk with a qualified healthcare provider before starting a new supplement, especially if you are pregnant, nursing, take medication or manage a health condition.

Sources

1. Covarrubias AJ, Perrone R, Grozio A, Verdin E. NAD+ metabolism and its roles in cellular processes during ageing. Nature Reviews Molecular Cell Biology, 2021. https://pubmed.ncbi.nlm.nih.gov/33353981/
2. Grant R, et al. 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, 2019. https://pubmed.ncbi.nlm.nih.gov/31572171/
3. Randomized, placebo-controlled pilot of intravenous NAD+ in adults over 40 (preprint). medRxiv, 2024. https://www.medrxiv.org/content/10.1101/2024.06.06.24308565v1.full
4. Yi L, Maier AB, Tao R, et al. The efficacy and safety of beta-nicotinamide mononucleotide (NMN) supplementation in healthy middle-aged adults. GeroScience, 2023. https://pubmed.ncbi.nlm.nih.gov/36482258/
5. Morifuji M, Higashi S, Ebihara S, Nagata M. Ingestion of beta-nicotinamide mononucleotide increased blood NAD levels, maintained walking speed, and improved sleep quality in older adults. GeroScience, 2024. https://pubmed.ncbi.nlm.nih.gov/38789831/
6. Ulusoy S, et al. Mechanisms and solutions for nasal drug delivery: a narrative review. European Review for Medical and Pharmacological Sciences, 2022. https://pubmed.ncbi.nlm.nih.gov/36524914/
7. U.S. Food and Drug Administration. Compounding and the FDA: Questions and Answers. https://www.fda.gov/drugs/human-drug-compounding/compounding-and-fda-questions-and-answers