Sulforaphane.  Pharmaceutical companies have studied it for years because of its very positive effects on cancer.  You get it when you chew raw broccoli because then two compounds in the broccoli come together and create this new compound.  Even better if you chew the raw broccoli with mustard.  Broccoli sprouts have 10x the amount of sulforaphane as the mature plant.  Grind up a small amount of the sprouts as the first ingredient in your smoothie, but not too much because the taste is terrible.

Best Vegan Protein Sources