Well it wouldn't be going through people, but admittedly it can wash off into drains or in the sea if you go swimming. Some sunscreen ingredients are just as bad, and they're used in much bigger quantities. There's no such thing as a free lunch. But, as for its effects on skin, I've been using it for decades and my 72-year-old skin is as smooth as a baby's bottom. ;-). No science there, of course...