Many nutritionists are talking about the great benefits of antioxidants. Antioxidants can help to strengthen the immune system and help to control the free radicals in our bodies. Goji berries are very high in antioxidants, in fact it is said that goji berries are one of the richest and most nutritious food sources on the planet. The ORAC scale is used to measure the amount of antioxidants in a food source. Goji berries rank higher then any other food source ever tested.