Rep-Cal Ultrafine (fine grind) is an excellent source of calcium for all reptiles and amphibians. Scientifically formulated from 100% natural Oyster Shell phosphorous-free calcium carbonate with added Vitamin D3 to aid in the absorption of calcium. Dosage: We ask that you mix Rep-Cal with our vitamin supplement Herptivite. If we premixed the products, the "beadlets" of beta carotene in Herptivite may possibly be damaged during manufacturing by the calcium in Rep-Cal. Mix with vegetables, fruits, and pastes approximately 1/2 tablespoon Rep-Cal with 1/2 tbsp. Herptivite per lb.of food. Before feeding insects: 1) Thoroughly mix a 1:1 ratio of Rep-Cal and Herptivite in a plastic bag. 2) Place insects in the bag. 3) Shake slowly until they are completely covered. No other supplementation is required.