Bok choy is low in calories and contains many phyto-nutrients, vitamins, and minerals. One cup of shredded bok choy has more than a full days intake of vitamin A and contains 52% recommended daily value of vitamin C. This vegetable is important when it comes to blood pressure. It provides ample potassium (176 mg/cup) and nondairy calcium (74 mg/cup), two minerals which are essential for controlling blood pressure. Bok choy is low in oxalates which decrease calcium absorption. It is rich is anti-oxidants that help prevent heart disease and cancer.