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Any dust, including silica, can be irritating to the eyes. When diatomaceous earth is eaten, very little is absorbed into the body. The remaining portion is rapidly excreted. Small amounts of silica are normally present in all body tissues, and it is normal to find silicon dioxide in urine. In one study, people ate a few grams of diatomaceous earth. The amount of silicon dioxide in their urine was unchanged. After inhalation of amorphous diatomaceous earth, it is rapidly eliminated from lung tissue.

However, crystalline diatomaceous earth is much smaller, and it may accumulate in lung tissue and lymph nodes. Very low levels of crystalline diatomaceous earth may be found in pesticide products. When mice were forced to breathe diatomaceous earth for one hour each day for a year, there was an increase in lung cancers. When rats were fed silica at a high dose for two years, there was no increase in cancer development.

Amorphous diatomaceous earth has not been associated with any cancers in people. In a rabbit study, researchers found no health effects after applying diatomaceous earth to the rabbits' skin five times per week for three weeks.

In a rat study, researchers fed rats high doses of diatomaceous earth for six months. They found no reproductive or developmental effects. In another rat study, the only effect was more rapid weight gain. When guinea pigs were forced to breathe air containing diatomaceous earth for 2 years, there was slightly more connective tissue in their lungs. When researchers checked before the 2-year mark, no effects were found. A very small amount of crystalline diatomaceous earth may be found in pesticide products.

Long-term inhalation of the crystalline form is associated with silicosis, chronic bronchitis, and other respiratory problems. The bulk of diatomaceous earth is amorphous , not crystalline. The amorphous form is only associated with mild, reversible lung inflammation. Children may be especially sensitive to pesticides compared to adults.

However, there are currently no data to conclude that children have an increased sensitivity specifically to diatomaceous earth.

Silicon is a major component of diatomaceous earth. It is the second most abundant element in soils. It's a common component of rocks, sands, and clays. It is also abundant in plants and plays a role in their growth and development.

Due to its chemical makeup, diatomaceous earth is not degraded by microbes or by sunlight. Also, it does not emit vapors or dissolve well in water. The ocean contains vast amounts of diatomaceous earth. Many marine organisms use it to build their skeletons. Diatomaceous earth is practically non-toxic to fish and aquatic invertebrates.

It is commonly encountered by birds and other wildlife , and it's not known to be harmful. However, no toxicity evaluations for wildlife were found. Agencies have stated that diatomaceous earth is unlikely to affect birds, fish, or other wildlife in a harmful way. Diatomaceous earth is made of silicon dioxide. When chickens were fed a diet that contained less silicon dioxide than normal, their bone formation was harmed.

This suggests that silicon dioxide plays an important role in bone formation. NPIC provides objective, science-based answers to questions about pesticides. Please cite as: Bunch, T.

NPIC fact sheets are designed to answer questions that are commonly asked by the general public about pesticides that are regulated by the U. Environmental Protection Agency U. This document is intended to be educational in nature and helpful to consumers for making decisions about pesticide use.

NPIC provides objective, science-based information about pesticides and pesticide-related topics to enable people to make informed decisions. Environmental Protection Agency cooperative agreement X The information in this publication does not in any way replace or supersede the restrictions, precautions, directions, or other information on the pesticide label or any other regulatory requirements, nor does it necessarily reflect the position of the U.

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