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You can't really overfeed a chameleon with calcium supplements given orally as long as the chameleon gets a good supplementation of Vit. D3 and UVB lightning, because the orally too much fed calcium then leaves the animal via feces.
I'll try to explain the differences easily and hopefully you will understand my weird english.
I said: An over supplementation only with calcium does not result in any problems, because it's eliminated via feces (= not resorbed in the gut). As long as D3 level's well . The chameleon body can produce D3 via UVB lightning or he gets D3 via supplementation by the owner. If the animal has a good D3 level, calcium will leave the gut without being changed or resorbed at all (D3 controls calcium resorption from the gut). So you can't overdose calcium as single supplementation while keeping an optimal D3 level.
What you mean is a D3 hypervitaminosis, which is an ill situation for the body. More D3 means more calcium resorption in the gut and forces bones to release calcium, too. This leads to signs of metabolic bone disease (looks same if you feed too less calcium/D3, which mostly causes mbd), renal calcinosis or calcification of other viscerals. The reason ist not an overdosage of calcium, but of D3.