Nasal SprayFrom $166/mo
InjectionFrom $166/mo
Medically reviewed by Vanessa Niles, R.N., M.D., F.A.C.O.G. —
The short answer
Neither has been shown to work better. Oral NAD+ precursors such as NR and NMN have small human trials showing they raise blood NAD+, while NAD+ nasal spray hasn't been tested in people. NAD+ itself taken by mouth appears to be broken down in the gut in animal research.
- 'NAD pill' can mean NAD+, NADH, NR or NMN, which are different molecules.
- NR and NMN have small human trials; spray has none.
- Oral NADH had modest results in a small 1999 fatigue trial.
- Pills are over-the-counter supplements; spray is a prescription.
What's in an NAD pill
Supplements may contain NADH, NR (nicotinamide riboside) or NMN (nicotinamide mononucleotide). In September 2025 the FDA concluded NMN isn't excluded from the dietary supplement definition, reversing its 2022 view.
What the trials show
NR raised NAD+ in blood cells by about 60% in older adults over six weeks. NMN at 300 to 900 mg a day raised blood NAD in a 60-day trial. In a small 1999 crossover trial of oral NADH for chronic fatigue syndrome, 8 of 26 people responded, against 2 of 26 on placebo.
For NAD+ nasal spray, we found no published human trials.
Comparison
Spray vs pill
Different molecules, different routes, different levels of evidence. Your provider can help you weigh them.
Practical differences
- Pills: over the counter, no prescription, quality varies by brand
- Spray: prescription, compounded by a licensed pharmacy, provider follow-up
- Neither: FDA-approved to treat aging or any condition
NAD+ terms used in this guide
Questions
Questions people also ask
Can I take NR or NMN with the spray?
Ask your provider and list every supplement at your consultation.
Are pills cheaper?
Often, but quality varies, and the molecules differ from prescription NAD+.
Why not just take NAD+ pills?
Animal research suggests NAD+ swallowed by mouth is broken down in the gut, so precursors are studied instead.
Are NAD+ pills regulated like prescriptions?
No. Dietary supplements don't need FDA approval before they're sold, so quality and dose can vary by brand.
Can I switch from pills to the spray?
Yes, after a consultation. Tell your provider which supplements you've been taking.
Which costs less?
Supplements are often cheaper, but they're different molecules and aren't prescribed or monitored by a provider.
Keep reading
Related NAD+ guides
- NAD+ Nasal Spray Effectiveness: Does It Really Work Well?Does NAD+ nasal spray work? See what research shows about intranasal NAD+, why human trials are missing and how to judge whether it's worth trying.NAD+ nasal spray
- NAD+ Nasal Spray vs Injection: Which Delivery Method Wins?NAD+ nasal spray or injection? Compare how each is used, side effects, needles, convenience and evidence, and see why neither has been proven better.NAD+ nasal spray
- NAD+ Nasal Spray Prescription: Do You Actually Need One?Do you need a prescription for NAD+ nasal spray? Compounded NAD+ spray from a licensed pharmacy does. Learn why, how to get one online and what to avoid.NAD+ nasal spray
Official sources
Sources and official resources
Official government and research sources behind this page, so you can check the facts yourself.
- NIH PubMed CentralMartens et al. Chronic nicotinamide riboside supplementation is well-tolerated and elevates NAD+ in healthy middle-aged and older adults (2018)
Randomized crossover trial of oral NR in healthy adults.
- GeroScienceYi et al. The efficacy and safety of NMN supplementation in healthy middle-aged adults (2023)
60-day randomized trial of 300, 600 and 900 mg/day oral NMN.
- NIH PubMedForsyth et al. Therapeutic effects of oral NADH on the symptoms of patients with chronic fatigue syndrome (1999)
Small placebo-controlled crossover trial of oral NADH.
- NIH PubMedDigestion and absorption of NAD by the small intestine of the rat (1983)
Animal research on how NAD is broken down in the gut.
- U.S. Food and Drug Administration (Regulations.gov)FDA response to citizen petition on NMN, docket FDA-2023-P-0872 (2025)
FDA concluded NMN is not excluded from the definition of a dietary supplement.
- NIH Office of Dietary SupplementsNiacin: Health Professional Fact Sheet
Explains how the body turns niacin (vitamin B3) into NAD, a coenzyme used by more than 400 enzymes.
Medically reviewed by Dr. Vanessa Niles, R.N., M.D., F.A.C.O.G., on October 12, 2026. This article is general education, not medical advice. NAD+ has no FDA-approved use, and compounded NAD+ is not FDA-approved or evaluated by the FDA for safety or effectiveness. Only your provider can set your dose.
Talk it through with a provider
Book a free online consultation. If NAD+ fits, a licensed U.S. provider prescribes the nasal spray or injection, with plans from $166 a month.
Book a free consultation