Gut loading crickets for reptiles?

To much calcium in meal worm, and crickets diet can cause molting problem. You can put the multivitamin and im sure they would at least eat some of it. Don't listen to anyone who says don't give geckos dust with d3. It would be very hard to overdose on d3. Even if you tried. And its nearly impossible for reptiles to overdose on calcium. They'd die of impaction from the calcium absorbing the stomach acids before they'd die from overdose.