Who knew popcorn is so good for you? Rocky Mountain Popcorn is all natural, gluten-free, and certified non-GMO kernels . Popcorn is a great source of protein, with more protein than any other whole grain. Popcorn also has more iron content per serving than spinach or eggs! What most people don’t know is that popcorn is high in antioxidants, most notably the plant extract polyphenol. This chemical is of the same family of chemicals that contributes to the health benefits of foods like red wine, chocolate, tea, and olive oil.