I'm sure the senior members will groan at the sight of another calcium supplement question, but I have been browsing both stores, herp scientific journals, and forums and I'm not finding the answers I want. I have a leopard gecko and, being nocturnal, I know I need a calcium supplement with D3 because they don't spend enough time in daylight to make their own. I had been doing some research for a term paper though, and found a brief discussion of a case study on D3 overdose in reptiles causing calcium deposits to accumulate in organ tissue. I have not been able to find much else on the subject including how much D3 is too much. To be safe I wanted to pick up a d3-free supplement to replace the powder I have available in the tank (I will continue to dust all feeders with the d3-included), but I haven't been able to find any that do not have either magnesium or cellulose products. Does anyone have any calcium supplement brands available in Canada that are gecko safe? Also, does anyone have any info on D3-overdosing in herps?