Beet leaves are an excellent source of vitamin K, vitamin A (in the form of carotenoids), vitamin C, copper, potassium, manganese, vitamin B2, magnesium, vitamin E, fiber and calcium. They are a very good source of iron, vitamins B1, B6, and pantothenic acid, as well as phosphorus and protein. Beet leaves boost immunity, lower blood pressure, improve mental health, strengthen bones, and more.