Vitamin K is no doubt some good stuff, and watercress is loaded with it. According to Dr. Scott Schreiber, certified nutrition specialist and licensed dietitian/nutritionist, vitamin K can assist with blood clotting, strengthening of bones, and brain damage prevention. "Vitamin K has a potential role in bone health through promoting osteotropic (bone formation and strengthening) activity," Ficek adds.
It's good for your eyes
Since it's also an excellent source of vitamin A, which you remember from when your mom told you to eat your carrots, watercress helps support your eyesight. And, according to Ficek, the leafy green is also a great source of flavonoid antioxidants like beta-carotene, lutein, and zeaxanthin.