This site's own mechanism framework lists this specific second stage — worth understanding it on its own, distinct from the named-ingredient stage before it.
This site describes it directly: the Neuro-Optimizer Blend is described as supporting neural connections and neurotransmitter balance. Its ingredients are not named.
Worth reading this stage's purpose-only description directly alongside this site's own dedicated disclosure that the Neuro-Optimizer Blend is not itemized — the mechanism claim and the transparency gap sit together here.