This site's fourth mechanism front is mental energy — worth understanding on its own, distinct from the brain-cell-health and oxidative-defense fronts.
This site describes this front directly: helps reduce mental fatigue and supports steady, sustained brain energy — worth reading as distinct from the stimulant-based energy many competing products rely on.
Vitamin B12 and Rhodiola Rosea are the two ingredients this site most directly connects to this front, per its own ingredient breakdown — each with a distinct standalone mechanism guide.