Green beans are an excellent source of vitamin K. They are a very good source of manganese, vitamin C, dietary fiber, folate and vitamin B2. In addition, green beans are a good source of copper, vitamin B1, chromium, magnesium, calcium, potassium, phosphorus, choline, vitamin A (in the form of carotenoids), niacin, protein, omega-3 fatty acids, iron, vitamin B6 and vitamin E. Green beans have also been shown to contain valuable amounts of the mineral silicon, and in a form that makes it easier for us to absorb this bone-supportive and connective tissue-supportive nutrient.