Hi my awnser to your question would be a surprinsing none. Your iguana is a BIG STRONG ADULT MALE, what you need to do is give him regular acess to direct sun ligth, a very varied 100% vegetarian diet with plenty of naturaly calcium rich foods enfatizing dark leafy vegetables and your good to go. Thouse suplements can do good but excess will do harm. A well fed and healty iguana such as yours doesant need thouse, specialy a male, it can stress its kidneys and that would be really bad. Also dont forget to offer plenty of water to drink and high humity to keep thouse kidneys on top shape

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