I remember my Dear departed father starting each day with eggs in milk and a handful of Brewer's yeast, back in the 70s. As someone who was left with having to deal with the long term physical and psychological effects of being a combatant in WWII, he swore that the combination kept him physically healthier and emotionally calmer.
I find that not only a Mega-dose of B vits, but notably Fish oil ( originally taken for my sporting hobbies ) seems to encourage a better level of stability for me. I once read of an interesting 'demo' of fish oils, ( or seed based equivalents ) - that was to hold a mouthful of oil for about half a minute, and feel how your muscles noticably relax. It worked on me, whereas other 'test substances' did not. It makes sense that the brain's fatty acid composition , would benefit from being 'topped up' on a daily basis with such oils - and of course the smooth running of the energy release and myriad other systems would run smoother on a good B vitamin 'blast' - with the added benefit of the Selenium in Brewer's yeast.
I prefer a full range high dose B vitamin compound, as not only do I want the added B12 , but also the relatively high levels of Tyramine in Brewer's Yeast could potentially cause a hyper-tensive crisis in one who has to take M.A.O.I medication throughout the day.