The type of iron that is the most absorbable plus the easiest on your digestive system is Carbonyl iron and Ferrous Fumerate. I use the Carbonyl iron made by Sundown. I haven't had any problems with dark stools or digestive problems.
The most common iron is the ferrous sulfate but you will find that is also the one that causes the most problems when you take it.
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~Beth~
Little Victories; Grand Rapids, MI
Bariatric Support Group
Diabetes, high blood pressure, sleep apnea, high cholesterol,
peripheral vein disease, joint pain and 210 lbs GONE!! 
Century Club: July 3, 2006
ONE-derland: Dec. 22, 2006
Double Century: May 29, 2007
Goal: June 15, 2008
Lap RNY: 1/30/06-Dr Randal Baker
TT/BL: 09/21/07-Dr Ronald Ford
PS Revisions: 04/29/08-Dr Ronald Ford
Gallbladder: 05/14/08-Dr Randal Baker
Emergency surgery (Intussusception): 02/29/09-Dr James Foote
"...if we pay attention to the fact that we can move,
breathe, feel, laugh, cry and notice sunsets,
there IS cause for joy." 
- Geneen Roth
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