Inorganic nitrate or nitrite supplementation does not improve cognitive function or cerebral blood flow in healthy young adults, as existing trials have primarily enrolled healthy, normal-weight participants under age 36, limiting generalizability to older or cognitively impaired populations.

When inorganic nitrate is consumed, bacteria in the mouth convert it to nitrite, which is then turned into nitric oxide in the blood and tissues. Nitric oxide causes blood vessels in the brain to widen, increasing blood flow. This increased blood flow delivers more oxygen and nutrients to brain cells, which should support thinking and memory. However, in healthy young adults, this process does not result in measurable improvements in brain function or blood flow.