I have never experienced brain fog except when I go 36 hours or more without sleep. The adrenal and eyes need the most vitamin C. Burns, injuries, shock disease stress draw vitamin C away from the eyes and adrenals. I am a carnivore, eat few vegetables but, eat as much fresh fruit as I can and keep in the house, live 45 miles from a supermarket. I take many, many vitamins, minerals and Supplements. Seldom take them all at same time or day.I have felt good almost every day of my life. Two weeks in an Air Force Hospital with strep throat was the worst. In the 1980,s I learned how to knock strep throat dead in two days and did it for two of my store customers. I know for a fact that vitamin C eliminates sensitive teeth, pain and inflammation. I have many bad and broken teeth. I have kept pain and inflammation away for over 3 years with 8 to 12 grams of vitamin C every day. Two months ago I lost another filling, instant pain. It took 35 grams over the day to subdue it completely. I cannot afford to fix my teeth without losing the farm. I take care of my stomach and it take care of me. I am 82 years young.
There are many roads to good health, Take care!