Between a good diet, and good husbandry, supplements are not needed. Anyone who sees MBD with a carnivorous reptile is feeding a very bad diet, whole animals dont have that problem.
There are many plants and food sources that have calcium levels much higher than many processed foods, also they are easier digested, and made better use of.
Why have I seen thousands of reptiles on the edge of death, with MBD, starving, dehydrating, that came to a reptile rescue. After they were set up in useful cages, fed a good simple diet, and kept under standard household lightbulbs they didnt even resemble the same animal in a few weeks, in fact the former owners didnt even recognize the animal in some cases. Most of the tegus had MBD, most lived beforehand on canned or prepared catfoods and diets, were fed fresh fruits, etc, but they were dieing. These animals were switched to whole animals such as rodents as their primary food source, most have never eaten anything but whole animals since, years later they are thriving on that diet.
In 16 years of keeping monitors, and over 20 years with other reptiles Ive never had MBD as a problem, Ive never seen impactions.
The best way is for some of these people to try for themselves, and see what happens, but wouldnt it be easier to try what works, and experiment from there, instead of killing a few reptiles to learn the hard way, just the very basics?

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