These wondrous pumpkin seeds are very popular, and not just because they make a great crunchy snack. They are a great source of protein and dietary fibre to keep you feeling full and energized, and a very good source of antioxidant vitamin E. They are also an excellent source of manganese, essential to maintain healthy bones and fight inflammation. Pumpkin seeds also contain the amino acid tryptophan, which the body converts into serotonin, often called natures sleeping pill.