This thread is a bit old, but I wanted to put my 2c in.
Personally I am taking Blackmore's Gold + Fefol Iron, as there wasn't enough iron in the Blackmore's for me. I did not want to take Elevit, despite
OB's recommendation, because it has no iodine in it, and after watching the ABC program "The Man who Saved a Million Brains" I was far too frightened to contemplate not having iodine. I can post the transcript of the program, or you could go to the ABC website and look for the program transcript- it's under Science and Technology.
Basically, since dairy farmers stopped cleaning their equipment with iodine, we have virtually no iodine coming into our diet at all- we used to get enough from dairy due to positive contamination. This deficiency leads directly to thyroid problems, eyesight problems and brain development problems- cretinism, in the medical sense of the word, is a direct consequence.
So I got the supplement with iodine. Oh, and I bought iodised salt.
(But those of you who've said that iron supplements have led to constipation- oh, I hear you! Not even half a packet of prunes gets things moving!)