Three Ingredients: Pulverized Limestone, Hardwood Ashes, Fossil Shell Flour Poultry Powder is 3 natural ingredients. Pulverized Limestone, Hardwood Ashes and Fossil Shell Flour. All three natural ingredients work together to keep birds healthy, happy and their feathers clean. The pulverized calcium works with the natural ashes to clean and revitalize skin and feathers. The Fossil Shell Flour aides in ridding your feathered friends of any critters that nest in the feathers. Fossil Shell Flour is made from the fossilized remains of tiny, aquatic organisms called diatoms. Their skeletons are made of a natural substance called silica. It causes insects to dry out by absorbing the oils and fats from the cuticle of the insect's exoskeleton. Its sharp edges are abrasive, speeding up the process. The attached video shows our product with Chickens and Turkeys field testing Poultry Powder. They weren't complaining at all, packed in the same bathing hole. Made in the USA - All ingredients were quarried in the USA and Wood Ash burned and sifted here in Tennessee.