Glucosinolates are found in watercress, as they are in other cruciferous plants. It would include more than broccoli, cauliflower, and many cabbage kinds (white, red, Savoy cabbage and bok choy). Garden cress has roughly four times the amount of watercress, however the amount varies depending on the location (sun exposure, temperature). When food containing glucosinolates is diced, chewed, or comes into touch with the gut bacterial flora, they can change into active molecules (isothiocyanates). Several of these compounds have been shown to help prevent the spread of certain malignancies.