What is the opposite of contaminate?

Need antonyms for contaminate? Here's a list of opposite words from our thesaurus that you can use instead.

Verb
Opposite of to make something dangerous or toxic by introducing impurities or foreign matter
Verb
(usually of a disease or condition) Opposite of to affect adversely
“Eating a healthy and balanced meal will help to protect against all forms of malnutrition.”
Verb
Opposite of alter or debase, often for profit
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