I have been iron deficient for several years and highly fatigued (hair falls out too and heart beat is rapid). I tried supplements but they made me constipated. I tried iron in water from a European spring which chewed up my stomach with nausea. I tried Floradix which didn't constipate me but it was slow going in terms of raising iron stores -- it also stained my teeth.
Then a friend of mine got a prescription from her doctor called Integra Plus. I asked my doctor for it. It's amazing!!!! Within 3 weeks I am feeling like a million dollars. My brain seems to be working better (clearer and sharper) and my energy is much greater. I feel less depressed.
But the best part is that it causes no constipation or stomach aches or nausea. Yeah!

. I'm chronically constipated so this is a miracle. You take it in the afternoon between meals. It also contains B vitamins and folic acid and Vitamin C. It only costs $10 on my prescription plan. It's not over the counter.
For any of you who are iron deficient, you have to try this drug! I can't wait to see how I feel 2 months out and even longer. It could change your life if you haven't been able to tolerate iron supplements.
Good luck!