iron pills

I ran out of iron pills, and forgot what type of iron I'm suppose to take.  Iron Sulfate, Iron Gluconate?  Any help.  Still at 197 pounds but feeling great.

I was only told to take a multi-vitamin with at least 18 mg of iron; type was never specified.  Now I am on 3 times that because my 3 month followup showed my iron at the minimal acceptable level. I do feel better at the higher dosage.  I know the Ferreous Sulfate (Iron) alone is good but makes people nauseous as I have tried it before surgery and my wife uses it for restless legs syndrome.