I've read in several online biking guides recently that long-distance athletes tend to be low on iron which may explain why they added it. and depending on how many mg you're getting - it may not upset the stomache that much.
So where can I find this "ultima"?......it sounds like something I might want to look into.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"