See Page 33 - 35 Consider the Vit K2 plus fish based high Vit A - your brain fog will disappear in no time, so says Dr. K. Vitamin A has to be fish-based A and fairly high amounts (25,000-50,000). K2 needs the A to work.
It was one of my worst and long lasting symptoms years ago - Now we know a lot more.
I still use Thorne K2 and Vit A - whenever I test for it with my tensor, I take it.
Of course you can learn a lot more by going through the whole protocol. Always something new....