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Organic diatomaceous earth is made of the fossils of freshwater organisms called diatoms, a type of hard-shelled algae which are crushed to a fine powder. Completely safe for all animals, it is deadly to fleas, ticks, lice, bed bugs, and other insects. D/Earth scratches the insect"s waxy outer shell, eventually causing death by dehydration. Use as a topical dusting for animals or around the kennel and bedding for environmental control. Also can be used as a supplement to improve health and appearance problems associated with internal parasites. Comes in a 12 ounce shaker bottle, 3 pound jar, or 10 pound bulk jar. * Product is labeled "not for human consumption" to meet the legal requirements of the FDA for products sold and marketed for pet use and consumption. While many products sold for "Pet Use" may be similar to products used by humans, Thomas Laboratories is obligated to remain within the boundaries set forth by the FDA regarding correct and current labeling of our products. ** Diatomaceous Earth, while safe to swallow, can be a lung irritant if breathed in. Please take all precautions neccesary (dust masks, respirators, etc.) to avoid breathing in dust. When applying this product to pet bedding or household carpeting, furniture, or flooring, please apply sparingly and allow dust to settle before re-population of pets and humans