Rep-Cal Calcium with Vitamin D3 (Ultrafine Powder) is an excellent source of calcium for all reptiles and amphibians. Scientifically formulated from 100% natural Oyster Shell phosphorous-free calcium carbonate without added Vitamin D3. Dosage: It is recommended that you mix the Rep-Cal Calcium with the Rep-Cal vitamin supplement Herptivite. If the products were premixed, the "beadlets" of beta carotene in Herptivite may possibly be damaged during manufacturing by the calcium. Mix with vegetables, fruits, and pastes approximately 1/2 tablespoon Rep-Cal with 1/2 tablespoon Herptivite per pound of food. Before feeding insects: 1) Thoroughly mix a 1:1 ratio of Rep-Cal Calcium and Herptivite in a plastic bag or cup. 2) Place insects in the bag/cup. 3) Shake slowly until they are completely covered. No other supplementation is required.