NAD+ Nasal Spray vs Oral NAD+: Does Either Work?

Does NAD+ nasal spray work?

No published human trial shows that NAD+ nasal spray works. As of 10.12.26, PubMed, Consensus and ClinicalTrials.gov list no human trial of it. The only published intranasal NAD+ study used mice and lab-grown cells and measured smell, not energy or aging. Human NAD+ research mostly studied oral precursors such as NMN and NR.

The intranasal study is reference [1]. Oral precursors raised blood NAD+ levels, but effects on health outcomes were mixed and often not significant [5].

What is NAD+?

NAD+ (nicotinamide adenine dinucleotide) is a coenzyme found in every cell. It plays a role in how cells produce energy, and enzymes use it for DNA repair and cell signaling. Researchers have reported that NAD+ levels decline with age in some tissues, which is why NAD+ has drawn interest in aging research.

Sources: [3][5].

What is the difference between NAD+ nasal spray and oral NAD+?

The difference is the route. NAD+ nasal spray is sprayed into the nose, where it meets the nasal lining. Oral NAD+ is swallowed as a tablet or capsule and passes through the digestive tract and liver before reaching the bloodstream. Neither compounded form has been studied in published human trials.

What does the research show for NAD+ nasal spray?

There are no published human trials of NAD+ nasal spray. A ClinicalTrials.gov search on 10.12.26 found no registered trial. The closest study gave NAD+ into the nose of mice with induced loss of smell and treated human smell-related stem cells in a dish. It did not study energy, aging or wellness in people.

The Stackhaus Health editorial team also searched PubMed and Consensus. The mouse and olfactory stem cell study is reference [1]. It measured smell-related outcomes in animals and does not show what NAD+ nasal spray does in people.

What does the research show for oral NAD+?

Most human research on oral NAD+ support studied precursors, compounds the body converts into NAD+, not NAD+ itself. A 2026 review of 33 human studies found that oral NR and NMN consistently raised NAD+-related markers and were generally well tolerated. Effects on function, metabolism and other health outcomes were mixed and often not significant.

That review is reference [5]. In a 12-week randomized, placebo-controlled trial in 30 healthy adults, 250 mg a day of the precursor nicotinamide mononucleotide (NMN) raised NAD+ levels in whole blood, with no obvious adverse effects [2].

One 2026 randomized trial tested a proprietary oral NAD+ formulation in 50 healthy adults for 5 days. It raised NAD+ inside blood cells but did not change NAD+ in plasma, and no clinical or wellbeing outcome changed after statistical correction [6]. That product was specially processed. Its results do not apply to compounded oral NAD+.

Raising a blood level is not the same as a health benefit. Higher measured NAD+ does not by itself show that a person will feel or function differently [5].

Is NAD+ FDA approved?

No. There is no FDA approved NAD+ drug in any form. Compounded NAD+ is prepared by a state-licensed pharmacy for an individual patient, and compounded medications are not FDA approved. The FDA does not review compounded drugs for safety, effectiveness or quality, and compounded NAD+ is not approved to treat any condition.

Source: [4]. FDA recall records reviewed on 10.12.26 for compounded NAD+ involve injectable vials and syringes, mostly over sterility concerns [7]. Stackhaus Health does not currently offer injectable NAD+.

Is NAD+ nasal spray safe?

Long-term safety of NAD+ nasal spray has not been studied. Reported side effects include nasal irritation, headache and nausea. Because compounded NAD+ is not FDA approved, complete information on how often side effects occur with each form is limited. A licensed provider reviews your health history and medications before deciding whether it is appropriate.

Important safety information. NAD+ may not be appropriate if you are pregnant or breastfeeding, or if you have a known sensitivity to nicotinamide or related compounds. Tell your provider about all medications, supplements and health conditions. Your provider reviews your health history before prescribing.

Which form is right for you?

A licensed provider decides. Neither NAD+ nasal spray nor oral NAD+ has been shown to work better than the other. Some patients prefer a spray and others prefer a tablet, but that is a preference, not evidence of better results. Your provider confirms which forms are available when reviewing your intake.

Which forms are available can change.

How does it work at Stackhaus Health?

You complete a free online intake about your health history and goals. A licensed provider reviews it and decides whether compounded NAD+ is appropriate. Completing the intake does not guarantee a prescription. If it is prescribed, a state-licensed pharmacy prepares and ships it, and the pharmacy name appears on your prescription label.

See compounded NAD+, all longevity options, our pharmacy network, does oral sermorelin work and our editorial policy.