This is completely wrong. Too much calcium with, or without D-3 acts as a binder and prevents the absorption of other nutrients. From Vitamin A, to just plain digesting the meal. Calcium is an ant-acid and too much of it just shuts down absorption in the gut by neutralizing stomach acid. One 500 mg tums is enough to reduce digestion in a 150 pound human... what do you think that does to the digestion of a 30 gram gecko. More than 2% calcium in a diet is detrimental imho, and a lot of people exceed this with their methods.
That quote is from Allen Repashy. I would definitely not give your leo Tums after reading that...

http://geckoforums.net/showthread.ph...highlight=tums