Ferrous sulfate
"I was anemic for years, and thought it was just the way I was.  I had no idea that the soda I was drinking was stopping my body from absorbing iron (and calcium).  One night, my heart rate didn't slow down.  I woke my husband and we went to the hospital.  I found that my anemia was so bad that my red blood cells couldn't get enough oxygen to my body, and my heart was racing trying to get more Oxygen delivered.  The doctors said my heart would have just given up had I not come in.



I found "normal" iron pills gave me horrible, painful gas.  Slow FE was the only iron that didn't. It's made differently than iron pills and your body is able to break it down without the difficult side effects, but it can cause constipation.  I eat 3 prunes a day."