I have a 5 y.o. son with UC. During his first and, so far, only flare I swear I could stop and start the bleeding very predictably within hours with a few diet changes (soy, eggs, dairy, wheat). I eventually decided it was likely dairy but possibly wheat too. At that time he was only on prednisone. A couple months later my infant started to bleed and the docs said cut out dairy as she's mainly breastfed and that's the likely cause. Eventually we realized it was actually on certain formula causing the blood and mucous and, when I compared and researched ingredients, the only thing I could find that might do it was carrageenan. This makes me wonder if that's not also at least a part of my son's problem too. All of the foods that were in the wheat and dairy category when he was flaring that caused bleeding had carrageenan in them! Anyhow, my main question is if you can't tolerate carrageenan do any of the meds mask the problem? If I give him carrageenan now while he's on pentasa or 6 MP should I expect nothing regardless of whether he has an issue with it? Or will he flare no matter what if he does eat it and has an intolerance/allergy? Also, how much do you find you have to eat to notice a problem and how long does it take to manifest itself?