...you can see that the chemicals are in small percentages, and are generally available in other consumer products.
Well yes, but very few of them are in products meant to be consumed orally!
But because of their uses, it is anticipated that consumers will ingest small amounts, so they are tested at those low concentrations. For example, people who swim in pools are expected to ingest small amounts of pool chemicals and not suffer adverse effects. Similarly, the chemicals in soaps, household cleaners and cosmetics will often be ingested from contact with one's hands. In those small amounts they should have little ill effect.
Isn't it different when you're deliberately ingesting large amounts?
