Pistachios are a good source of copper, phosphorus, potassium, magnesium, and B6. The nuts deliver 30 vitamins, minerals, and phytonutrients, so they pack a considerable wallop from a nutritional standpoint. Pistachio nuts deliver a nutritious array of important nutrients and compounds that support and assist body function. Pistachios are a good source of monounsaturated and polyunsaturated fats. These fats reduce blood cholesterol levels and lower risk of heart disease when they replace saturated fats in the diet.