Spinach is an excellent source of vitamin K, vitamin C, beta-carotene, folate and protein. This leafy green vegetable is a great source of manganese, magnesium and iron. Spinach also contains small amounts of beneficial B vitamins. These nutrients and minerals restore energy, increase vitality and improve blood quality. Spinach contains twice the amount of iron as other green vegetables. Spinach is alkaline-producing, which helps to regulate pH levels in the body. It is a rich dietary source of lutein, which promotes healthy vision and prevents macular degeneration. There are 13 known flavonoid compounds in spinach that function as antioxidants and maintain healthy bones, blood pressure, the skin, the brain and the nervous system.