toxicity

Hi, I've hear a lot of ppl mentioning the possibility of Vit D3 overdose. Has anyone actually had it happen to their animals? Does anyone have any idea what the actual symptoms look like?

I'm currently in a discussion elsewhere regarding the synthesis of D3 in reptiles. The care guide states (and many veterinary sources say the same) that: Excessive vitamins in the diet, especially vitamin D3, can lead to toxicity, and some species are more sensitive to overdose toxicity...