Did you know that you can save money and buy Centrum for the multivitamin? It also has better quality nutrients in it and you know what you are getting is in date. All you have to do is crush it. I know that wasn't what you asked, but I just thought I should put it out there. You might also want to read Melissa Kaplan's site :
Melissa Kaplan's Herp and Green Iguana Information Collection
She has a good recipe for a nice balanced iguana salad that should also be good for your Uro.