GD Pista Green Without Shell! Pistachios are loaded with nutrients. A 28-gram serving of pistachios contains good amounts of fiber protein potassium zinc phosphorus vitamin B6 and manganese. Pistachios are high in protein fiber and antioxidants. They also have several other important nutrients including vitamin B6 and potassium. Pistachios have fewer calories and more protein than most other nuts. Also their essential amino acid content is higher than any other nut.