Watercress is a cruciferous vegetable that contains a precursor to sulforaphane and other isothiocyanates such as allyl isothiocyanate.
I talk about this watercress study and so much more in a comprehensive video on broccoli sprouts and sulforaphane and their effects on cancer, mortality, aging, the brain, heart disease and more!
Video link: https://www.foundmyfitness.com/episodes/sulforaphane