Why Is EDTA in Deodorant?
EDTA is an ingredient that is used as a preservative in many underarm deodorants and antiperspirants. Because of its unique properties, this ingredient, which is considered safe for cosmetic use, prevents bacteria from growing.
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Properties
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EDTA stands for ethylenediaminetetraacetic acid; it's molecular formula is C10H16N2O8. It is an organic compound most commonly found in a salt form, usually disodium EDTA or calcium disodium EDTA.
Uses
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The primary use of EDTA is as a chelating agent. A chelating agent is a chemical that neutralizes metal ions that can cause unwanted reactions by bonding to them.
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Features
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EDTA can form up to six bonds to a single metal ion. The organic EDTA molecule surrounds the metal and makes it unreactive; this is called "sequestration," meaning "withdrawal from use."
Deodorant
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As a deodorant preservative, EDTA is thought to work by sequestering the metal ions needed by bacteria for growth.
Safety
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A 2002 review in the "International Journal of Toxicology" found the use of EDTA in deodorant and other cosmetic products to be safe.
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