Collard greens are an excellent source

Collard greens are an excellent source of vitamin K, vitamin A (in the form of carotenoids), manganese, vitamin C, dietary fiber, and calcium.. In addition, collard greens are a very good source of vitamin B1, vitamin 6, and iron. They are also a good source of vitamin E, copper, protein, magnesium, phosphorus, vitamin B5, folate, omega 3 fatty acids, niacin, vitamin B1, and potassium.