Spinach is full of important nutrients like Vitamins C and K, as well as potassium. It also boasts high levels of carotenoids like beta carotene, lutein, and zeaxanthin. Spinach has been studied for its potential to support a healthy cardiovascular system. One study found that consuming spinach may be associated with lower systolic blood pressure and higher nitric oxide, a molecule that helps the blood vessels relax and dilate.