Chlorine dioxide is a gas used in very small quantities to disinfect water. It is a disinfectant similar to bleach and is unsafe when used in large amounts.

Chlorine dioxide kills bacteria, viruses, and fungi. Very small amounts are used in public water treatment facilities. At high doses, it can damage red blood cells and the lining of the gastrointestinal (GI) tract.

Some people swish and spit mouthwash solutions containing small amounts of chlorine dioxide for bad breath, tooth plaque, and wound healing, but there is no good scientific evidence to support most of these uses. There is also no good evidence to support using chlorine dioxide for COVID-19.

The US FDA has warned consumers to avoid chlorine dioxide supplement products due to the risk for serious safety issues and death. These products often list another ingredient on the label called sodium chlorite and are marketed under names like Miracle Mineral Solution (MMS), Master Mineral Solution, and Miracle Mineral Supplement.

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