Hi, Patty and all:

Boron is very important, also, and most magnesium sold is the oxide, which is a totally useless fraud; magnesium malate is the preferred form.

I did have kidney stones until I began calcium supplementation at about 2g daily, mostly at night. It is difficult to say whether the carbonate is inferior or causes UTI (I have never been prone to this that I know about), but I have taken a lot of my Ca in carbonate form with no problems that I was aware of; it is probably better than none at all.

Best Regards,
John