I have been on iron 325mg x3 for five weeks. i am experiencing severe heartburn,nausea and constipation. could i be intolerant of oral iron?

Oral iron: Yes - of that preparation. Stop it for one week. Then try Slow Fe, on per day, in pm only, after food. Take with a vit c tab - 500 mg.

Iron causes constipa: Iron causes constipation. It may me helpful to try a differnet formulation. While on Iron, be sure to drink a lot of water and take in plenty of fiber. Why are you on so much iron anyway?