The day I take digestive enzymes, I don't have brain fog. But if I forget to take it for one meal, I have brain fog right after the meal. I don't understand why, but it works this way. The enzyme worked the first day I took it.
I don't remember my dosage for pantethine (I am not taking it now). I bought it from my local vitaminshoppe. I took the dosage suggested on the bottle. You may want to try high dosage than what is suggested on the bottle. There is good information about Molybdenum and Pantehine at http://www.modernherbalist.com