NAD+ nasal spray vs IV NAD+: What each route can tell us
Is NAD+ nasal spray comparable to IV NAD+?
Nasal NAD+ and IV NAD+ start in different places. An infusion delivers NAD+ into a vein. A spray deposits liquid in the nasal cavity. Human evidence does not establish equivalent exposure or benefits.
Follow the samples
In a 2019 pilot study, researchers followed NAD+ and related metabolites in plasma and urine during a six-hour IV infusion. Those samples let them ask how measured compounds changed over time under that infusion protocol. If you're curious whether an infusion improves how someone feels or functions, you'd need a study designed to measure that. Read the IV pilot.
For a spray, the story starts with droplets. A study would first have to account for the device and formulation, then measure what reached the target area over time. Even blood measurements would answer a different question from what reached a particular tissue. Read the review of nasal delivery devices. Read what happens after a spray lands in the nose.
Put three questions next to the comparison
| Question | What you'd need to see |
|---|---|
| Do they deliver comparable systemic exposure? | Human measurements for both routes, with comparable analytes and meaningful time points. |
| Do they produce the same clinical outcome? | A study that measures that outcome and can compare it across groups. |
| How do the formats differ in practice? | The labeled product, delivery device, and the setting in which the intervention is delivered. |
You can also compare nasal and oral NAD+ formats. or read what the nasal studies actually tested.
What if both list the same number of milligrams?
That number describes an amount in the formulation or protocol. Route, formulation and time affect the interpretation. Before taking a claim of equivalence seriously, ask which two measurements were actually compared.