Originally Posted by LBBV

Actually, the best way to give it calcium is to crush up some calcium-enriched Tums and mix it into his food. Alternatively, any pet store will sell powdered calcium for herbivores but Tums are cheaper, just as effective and have a nice cherry flavor

As for heat, do NOT use the heated rocks, because too many of them are cheap and the controllers burn out, burning the stomachs of the Ig. Their enclosure should be tall (Iguanas are climbers) and you can put heat lamps on the top (don't let them get close enough to actually touch them) and you should also have a UV grow light on the cage (UV is very important to Igs).

Juvenile Igs are very sensitive to cold, diet, UV, etc and most of them don't make it very long. Once they reach a certain age, they're much more hardy though.

Melissa Kaplan's Iguanas for Dummies is an excellent reference manual and should tell you everything you need to know.