Rep Cal Ultrafine Calcium Without Vitamin D3 contains only 100% natural phosphorous-free oyster shell calcium carbonate for its calcium source.

• No phosphorous or Vitamin D3
• For reptiles raised under natural sunlight conditions
• Contains 100% natural oyster shell calcium carbonate

Using a calcium supplement that also adds phosphorous makes no sense, as an adequate Ca:P ratio can never be achieved. Bone meal contains phosphorous.