I'm inclined to think that there's a huge hole in this discussion.
Genetics.
Know yourself, and your background, and make life as good as possible for as long as possible.
My late (he croaked it at 54) GP said to me once that about 80% of your health and longevity is genetic. 10% is diet/lifestyle (for the majority) and 10% is just luck.
I commented that he ran every day, kept fit, etc., etc., and he said, "My Father died in his fifties", and not two years later my fit as a fiddle doctor dropped dead with a heart attack.
Genetics at work, and I hope his children pay heed to his advice.
My family lives long. So does Himself's. Long and sound of mind. However I have RA and it is likely to be that luck thing for me. We'll see.
To the OP though, and his on topic thread.
I'm a fair skinned, green eyed Scot. Like most Northern Europeans I have evolved to optimise the low UV light of our often overcast isles....and yet I am still so low in VitaminD that I have a permanent prescription.
It's amazing the difference sufficient VitaminD makes to my mental accuity, to my alertness, my enthusiasm for doing stuff.
Same with Iron. Not enough Iron and I am both dull and drowsy. Lack of either and I don't heal so quickly too.
I have been vegetarian for most of my life. I reared two vegetarian sons, and the only thing my husband asked was that I saw that they had sufficient vitamins and minerals in their diet. We're 'good' vegetarians. It's not five a day, it's five at every meal, and nuts, and seeds and greenery too
I can't digest milk, they can and so can their Father, so that's one less worry for me. We do take a vegetarian multi vitamin and mineral tablet daily, making sure we have enough B12.
I mind the little ladies and men with the bowly legs, and the simple benefits of free milk at school that stopped that problem. I've seen the bones of those whose diet was so limited that their teeth fell out, and the bones that show Harris lines when nutitional lack stopped growth.
I was very careful with my children, and I care now that even with RA that my own diet is varied enough.
To be honest, I think if you get those vitamin balances right, then your mood is sound, you don't need to boost it, you don't need to warp the mind kind of thing.
I know when I've had caffeine, whether it be from tea or coffee or cola. I don't eat much chocolate, don't really have a sweet tooth, but I know that a bit of chocolate and a cuppa and it fair perks me up
I don't feel the need for anything else.
On the vitamin issue though, if I take B3 I am utterly miserable with what is called a Histamine Flush. Not funny, and not something I'd inflict on anyone else, yet niacine is one of those nootropics that is widely discussed.
https://nootropicsexpert.com/vitamin-b3-niacin/
Be aware, it's not suitable for everybody.
Interesting topic TeeDee