"the human health impacts of many such chemicals remain poorly understood"
The effects of ritual bathing (soap, scrubbing with washcloths, etc.) on the skin may also be "poorly understood". Many people also wear regularly-washed clothing.
When I look at the laundry-list of chemicals in personal-care products (soaps, shampoos) (and in foods ... sometimes, wow!) I often wonder how much effort goes into testing all of this gunk.
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