I have been taking strontium citrate for about a month and have been feeling very tired. I take them in the morning on an empty stomach and wait a couple of hours to eat. I have been getting more and more tired. I sleep well, 8 + hours a night. But I'm dragging all day. I've stopped the stontium today and will stay off it for a week to see if it helps. I have also noticed that my migraines seem worse and have read that stontium can cause headaches. Has anyone else had a problem with tiredness?