This site's own benefits section lists this specific second point directly: the label's second claim area, supported by a steady daily routine.
Worth noting this is the one benefit on this site's list explicitly tied to "a steady daily routine" rather than a named compound — worth reading that as this site being direct about the limits of what it can specifically attribute.
This site's own "a clearer head" buyer theme specifically describes feeling less foggy through the afternoon — worth reading that theme as one data point relevant to this stated benefit.