With me its not spectulation, I practice raising monitors. Oh, and breeding them. I have produced, let me guess, aprox. 100 generations of monitors.
I mix reptivite in with the calicum. 70/30, calicum to vitamins. Use on insects only.
I started using the vitamin mix, when I occurred a repeatable problem with odatriad monitors. Again only when fed insects, at the time, crickets/superworms/waxworms. and occasional wild grasshoppers(at times theirs billions around here). They had eye infections and nerve problems. They would not die from this, but eventually die from some normal infection. I had the University check it out and a reptile vet. They both could not come up with anything wrong. While they were working on the problem(it took months) I went to the store and bought Harts mountain reptile vitamins, mixed it 50/50 with reptile and the problem went away(reversed) in a matter of days. The vet even put down several animals to have them checked for whatever nasty thing they could think of. I then switched to RepCal because I could get it by the gallon.
At the very same time a friend in europe had it occur, and came up with the exact same cure, all on his own(don't know if a vet helped)
So no, its not spectulation. On the otherhand, I am not sure that calicum powder is of actual need, as I used it from the start. So its possible it could be a sugar pill. But I do not have Calicum problems and I have no need to test it. I simply do not need to be that smart, it works, I going with it. hahahahahahahaha I call it a works donut. It works don't it?
To clear it up a little, I did not see problems until I was raising groups of 20 or more together at a time. I never saw that problem when raising one or two monitors together at a time. Cheers