Goji Berries are a rich source of polysaccharides and one of the richest food sources of carotenoids (a better source than even carrots), including beta-carotene and zeaxanthin. They also contain beta-sitosterol and nineteen amino acids, including all nine essential amino acids. In addition, they are rich in potassium, contain complex B-vitamins, have higher levels of vitamin C than oranges and contain 21 trace minerals, including germanium, a trace mineral rarely found in foods.