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Spinach is also an excellent source of vitamin K, vitamin A, vitamin C and folate as well as being a good source of manganese, magnesium, iron and vitamin B2. Vitamin K is important for maintaining bone health and it is difficult to find vegetables richer in vitamin K than spinach.
Nutritional breakdown of spinach. One cup of raw spinach contains 27 calories, 0.86 grams of protein, 30 milligrams of calcium, 0.81 grams of iron, 24 milligrams of magnesium, 167 milligrams of potassium, 2813 IUs of Vitamin A and 58 micrograms of folate. Most of the calories in spinach come from protein.