Hi Ryan! CA/D3 are found together in some CA supplements because D3 enhances the CA absorption. Supplements should be adjusted to frogs age. Small froglets need more to build new bones fast, versus a full grown frog that just needs to maintain it's body physiological processes and preexisting bone mass.

Still, unless you are using a product for daily consumption, like Repashy's Calcium Plus; one a day is a bit too much. Here are some schedules you can start working with to get you started: http://www.frogforum.net/food-feeder...schedules.html. Good luck !