Does NAD+ nasal spray reach the brain?

Does a nasal NAD+ spray deliver NAD+ to the human brain?

The research reviewed in November 2026 did not establish that commercial nasal NAD+ sprays deliver NAD+ to the human brain. Animal findings are a starting point for research on specific formulations.

Follow a droplet

A pump releases liquid into the nasal cavity. Where the droplets land depends in part on the device and spray characteristics. Some material can be cleared from the nose. A deposition study can map where a spray lands. Absorption and brain exposure each take additional evidence. Read the review of nasal delivery devices.

Three places a delivery claim can stop

1. Nasal deposition. Where in the nasal cavity did the spray land?
2. Absorption. Did the compound cross a tissue barrier, and what did researchers measure in blood or another sampled compartment?
3. Brain exposure. Did a human study provide a credible measure of the relevant compound in the brain or a validated measure of brain exposure?

A result in one compartment doesn't stand in for a result in the next. Even evidence of brain exposure would leave a separate question about what, if anything, changed for the person. You can also compare nasal delivery with an IV infusion.

What do the animal studies show?

In an older rat study, researchers tested intranasal NAD+ in an experimental model of reduced blood flow to the brain. Another study examined the olfactory system and smell-related measures in mice after experimental injury. Both used defined models, with outcomes chosen for those experiments. An everyday spray in a human would need its own measurements. Read the rat study. · Read the olfaction study. Read what the nasal NAD+ studies actually tested.