Many substances that are considered potentially hazardous when consumed in large quantities are perfectly safe when used in the tiny amounts found within cosmetic products.
What it all boils down to is dose. Scientists use units, such as parts per billion and parts per million, when measuring tiny amounts. 1,000 parts per billion is the same as one part per million and both equate to approximately one bucketful in 80,000 baths; or a part per billion is equivalent to one second in 30 years.
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