Generally, the calcium intakes for wild chameleons are lower than those seen for chameleons in captivity. Their calcium may be limited, but it is highly available and much more is absorbed than what is likely typical for captive chameleons. Moreover, their metabolism has adapted so they maintain adequate blood and cell levels with only modest calcium stores. .Dark green vegetation is very high in calcium and is what a lot of wild prey is gut loaded with.also the natural exposure to sunlight.we cant replicate the gutloading the insects get in the wild too.