I believe I've read one should use D3 for torts that don't get a lot of natural sunlight, and without D3 for those that spend their time outdoors. This is because bodies generate their own vitamin D when exposed to sunlight, and vitamin D is fat soluble, which means it can can build up in the body because it's not excreted in urine when in excess.
Ok thank you to both of you. This helps a lot. I will start giving it to him about once a week. Once he gets bigger and starts spending Meroe time outside, I will switch to the calcium w out d3. thanks for your input.