Any ideas why my B12 would be through the roof high? Not only have I had a colectomy with a J-pouch, but also have lost much of my small bowel due to a small bowel obstruction cuttung off the blood supply. I have very little left of the small intestine. Most often you hear of low B12 and need for supplementation but mine is crazy high (like double the high end of normal). Thanks for any input.