I have covered which dietary supplements I use under the Feeding section, so this is just a short guideline for making your own selections. Choose a calcium supplement with a vitamin D-3 additive that is phosphorus-free and has only a low amount of vitamin A. Choose a multi-vitamin that contains vitamin D-3 and is phosphorus-free. What you chose is very important to your dragon’s health. It is necessary to maintain the proper levels in your dragon’s system. High levels of vitamin A will cause the calcium in your dragon to bind and not be used as needed for its health. Too little or too much of any supplement is bad. We use Rep-Cal Calcium with D-3 and Rep-Cal Herptivite Multivitamin.