This site states this directly in its own disclosure table: Antioxidant support — not itemized or dosed.
Worth reading this as this site's second specific undisclosed component, distinct from the Neuro-Optimizer Blend — two separate unnamed portions of the formula, each disclosed as unnamed in its own right.
This site's own "Sustain & Protect" stage ties directly to this antioxidant claim — worth reading both together as this site's consistent, if limited, description of this specific formula component.