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. 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. Rep-Cal contains only 100% Natural phosphorous-free oyster shell Calcium Carbonate for its calcium source. To coat insects: 1) Place insects and calcium powder in a plastic bag. 2) Shake slowly until insects are completely covered. Contains no added starch, sugar, soy, preservatives, artificial coloring, flavoring, or fragrance. Do not use if tamper proof seal is broken or missing. Consult your veterinarian for any special nutritional problems or advice.