I'll give you my experience. Vit D has helped to combat fatigue, and vit E has helped soothe my intestines. Digestive enzymes are helping to break food down, and the ever present probiotic helps in general breaking food down, reducing gas and cramping, and helping to regulate bms. I also take fiber caps to help bulk up my stool so I don't get the loose stuff every day. I've tried other supplements, but so far the above are the only ones that i've noticed any difference with. Hopefully this helps you out.
36 y.o. male
Diagnosed w/ UC in May '06, had symptoms since '99
Meds & supplements: LDN 3.0mg, Florastor, Lialda, Allegra, multi-vitamin, buproprion, fluoxetine, vit E, D, zinc, and pancreatic enzymes.