Goji berries are a good source of vitamins and minerals, including: vitamin C, fiber, iron, vitamin A, zinc, antioxidants. These berries contain all eight essential amino acids. A 1-ounce serving provides nearly 10 percent Trusted Source of your daily value for protein. For fruit, this is a surprising amount of protein. Due to the higher fiber content or complex carbs in goji berries, your blood sugar will raise more slowly, reducing your risk for a sugar crash afterward.