Not all cruciferous vegetables contain sulforaphane or glucoraphanin; for example, cabbage and cauliflower have essentially none, and kale generally lacks glucoraphanin except for the Red Russian variety.

“so if you eat any cruciferous vegetables you're getting isothiocyanates which are all closely related to each other they're all closely related to sulforaphane but for example cabbage has essentially none it's got other isothiocyanates that are good for you many of them cauliflower has essentially none kale doesn't have glucoraphanin to any great extent except as i recall there's one variety red russian kale that does have a substantial amount”