Nitric oxide (NO) is a small gas molecule with an outsized role in the body. Discovered as a signalling molecule in the late 1980s (a discovery that won the 1998 Nobel Prize in Medicine), NO is now known to regulate blood vessel dilation, neuronal signalling, and immune function.
How NO Is Made
The body produces NO through the enzyme nitric oxide synthase (NOS), which converts L-Arginine into NO and L-Citrulline. There are three forms of NOS — endothelial (eNOS), neuronal (nNOS), and inducible (iNOS) — each with distinct roles.
NO in the Brain
In the brain, NO plays two big roles. First, endothelial NO helps regulate cerebral blood flow — the same vasodilator effect it has in the rest of the body. Second, neuronal NO acts as a signalling molecule at synapses, involved in long-term potentiation, the cellular mechanism behind memory formation.
Why NO Levels Matter
Age, high blood pressure, oxidative stress, and endothelial dysfunction all reduce the body's ability to produce and use NO. Reduced NO signalling is associated with worse cerebral perfusion and, over time, with slower cognitive performance.
Supporting NO Naturally
You can't take NO directly — it's a gas with a half-life measured in seconds. What you can support is the substrate: L-Arginine and L-Citrulline. Dietary nitrates (from beets and leafy greens) also convert to NO through a separate pathway. Aerobic exercise upregulates NOS enzyme activity itself. See the exercise post for the details.
The MemoHoney Approach
MemoHoney® supports NO production through the arginine/citrulline pathway. By combining both precursors — plus antioxidant support that helps preserve NO from being scavenged by ROS — the formula supports the whole loop, not just one end of it. See how the ingredients fit together.
Bottom Line
NO is one of the most important molecules in cerebral circulation. Supporting the substrate and the endothelial system that produces it is one of the most direct nutritional levers for cognitive support.
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