I was on the same and just switched to Creon....I am in love with it. I think they are doing a great job. I don't know if my body needed the change too (the dose was also switched to make it comparable to the Ultrase) but I have responded very will with it. Creon also offers a program where you can get free vitamins, I am not sure if Zenpep does, but it is also nice to get a little help with vitamins if you can.