Sunflower seeds are rich in the B complex vitamins, which are essential for a healthy nervous system, and are a good source of phosphorus, magnesium, iron, calcium, potassium, protein and vitamin E. They also contain trace minerals, zinc, manganese, copper, chromium and carotene as well as monounsaturated and polyunsaturated fatty acids - types of 'good' fat that may help to protect the arteries.