Hi Mark, I've been taking the vitamin dose as above for the past 9 days. The days have unfortunately been really terrible for me. I have not had as many headaches and been so fatigued before. I fall asleep very early, sleep in, and then require naps throughout the day. Could any of the supplements I'm taking cause this extreme fatigue or increased headaches? I've also had quite an upset stomach for the past week. I really believe that one of, or the combination of vitamins, aren't agreeing with me. It seems like the most likely culprate for the headaches/fatigue would be the magnesium. What should I do? Reduce the magnesium dose or just take it at night? I've never been on a supplement regime like this before and don't know if it is only a coincidence that these symptoms have coincided with the regime.