My favorite Supplements for Cognitive Function, Mitochondria Protection is PQQ. I have one with CoQ10 and Bioperine in it. Bioperine Makes the Body take up the PQQ much more effectively. Then my favorite herbs: Ashwaghanda, Bacopa Monnieri, And Curcumin, Turmeric extract from the root.
For me it takes away Brain Fog. I feel better in my head, body and all over.
Been struggling before with some Brain Fog and Muscle pains. These absolutely helps me. Doesnt take it all away. But reduces it extremely good. Here is and Article about PQQ: https://selfhacked.com/blog/pqq-review/ I really recommend this supplement.
Here is my morning Stack: 
Ashwaghanda: https://selfhacked.com/blog/59-proven-scientific-benefits-ashwagandha-references/
Bacopa: https://selfhacked.com/blog/bacopa-monnieri-4/
Turmeric ( Curcumin ) : https://selfhacked.com/blog/curcumin-cures-top-15-scientifically-proven-health-benefits-with-references/
These references are absolutely one of the best to read from.
Enjoy while i do the same ;)
Non
Great interesting post! Upvoted en resteemed
good work