Versele Laga Colombine Ideal-Bloc is a rich source of minerals trace elements like calcium, phosphorus, sodium, iron zinc. All of these work together to help boost the immune system also aid in the absorption of other nutrients. Analytical constituents Crude ash 90.8%, Calcium 15%, Phosphorus 0.012% Sodium 0.65% Composition Loam, Oyster shells, Sea shells, Redstone Stomach gravel