Hello,
Though I have never had need to use a calcium shot for any of my animals, I have heard of many other people using them. The point is, even once the eggs are shelled, to replenish the calcium "borrowed" from the animal's bones for the calcification process. This is becuase the bones are somewhat weakened by this process as a result of the calcium being taken away from them for the egg making process. Though this is important, I too have found simply dusting the food items given to the female lizard to be a satisfactory way of supplying her with replacement calcium. Good discussion topic.

Regards, EMWhite