I want to share what has made me well after so long in hopes that it may help someone else. Apparently when I was 37 yrs. old, I developed an allergy to coffee without knowing it. My immune system was affected. I caught almost everything that was going around and suffered with it twice as long as anybody else. I had brain fog and debilitating weakness that came and went. The killer of this story is that I would drink more coffee to give me more energy which was only making it worse. I've tried many, many supplements but the only thing that has really helped all these years were weekly B-12 injections. I quit drinking coffee because of stomach discomfort. It took two weeks and I suddenly began to lose the brain fog and I can sleep again without meds. Good luck to all of you.