Heavy metals are a bit like Alice cooper and ozzy osborne they linger somewhat even when you think they should just give up.
Incidentally Antimony was sold as a reusable pill to purge the body. You swallowed a round metal ball that your body so disliked it made you puke and sh*t yourself hence purging you of course the sh*ting yourself was extra useful as you had to fish out the pill from it give it a wash and pop it back into the medicine jar for next time. The whole family could take turns using this wonder pill. From the same Victorian/ Edwardian era that brought you radium tonic to invigorate the elderly gentlemen and cocaine the cure all for catar seriously I joke not you could buy it from harrods!