Ulcerative Colitis: I have found the best way to safely and quickly kill off gut infections (without killing off the body's friendly bacteria) is to take high dose potassium iodide for a few days. This stuff is sold for use in case of radiation exposure, but potassium iodide safely kills off yeast, bacteria, fungus, viruses, and most parasites like giardia, etc. Take 100 to 120 mg (not mcg) on an empty stomach before going to bed and let it work its way through your intestines. Do for 3 days, once each evening, then wait 8 days and do it again (to catch any eggs that have hatched out). Iodide is very healing to the gut and should not exacerbate any conditions, though you may have a "die off" reaction if you have a massive infestation. I also recommend the GAPS diet for complete healing of the gut. I practically destroyed my gut using Flagyl etc, then restored it using the GAPS diet, and iodine/iodide. Now if I get any gut infection I take one 100 mg potassium iodide pill and it takes care of it in a couple hours. I have had no intestinal problems since. You can buy high strength potassium iodide on Amazon.com. Also, google "Iodine: the Universal medicine" for other good uses of iodine/iodide.