Rep-Cal Calcium - Phosphorus and Vitamin D3 Free (4.1 oz) Green Bottle Rep-Cal Calcium - Phosphorus and Vitamin D3 Free for reptiles. Calcium deficiency is a major dietary problem of captive reptiles and amphibians Maintaining a proper calcium:phosphorous (Ca:P) ratio in the diet of 1.5:1 is believed to be just as important nutritionally as an adequate Ca intake. The problem in most cases is an improper Ca:P ratio, not too little Ca. Pick up some Rep-Cal Calcium - Phosphorus and Vitamin D3 Free for your reptile today.