Sulforaphane and its metabolites are excreted in urine, leading to high concentrations in the bladder that may offer protection against bladder cancer.

“So what happens? Go in here, you eat sulforaphane or you ingest it or you can even put it on your skin. We've done a number trials showing protection against ultraviolet radiation. It gets metabolized, it gets excreted. How does it get excreted? In the urine. What happens to urine? It hangs around in the bladder. So what you wind up having is a high concentration, relatively high concentration of both sulforaphane and its active metabolites in the bladder bathing that bladder epithelium and it's only, obviously, periodically released. We think it would be the perfect place to demonstrate protection against cancer or cancer prevention.”