4. Beef liver
If you don’t mind the taste, beef liver is an excellent source of vitamin A; a single slice offers up a whopping 713 percent of the recommended daily intake. This organ meat is also a great source of iron, zinc, protein, vitamin B6, folate, niacin, riboflavin and so many other essential nutrients. For the most health benefits, only choose liver that comes from organic, grass-fed cows. You can certainly grill up beef liver or prepare it with onions and garlic; however, if you really want to disguise the taste, try mixing it in with a pasta sauce.