There are 80 different species of Wolfberries (Goji Berries) in the world. Of these species the NingXia Wolfberries have high levels of immune stimulating polysaccharides. It is also a nutrient dense fruit. It is a source of antioxidants (3650 ORAC – Oxygen Radical Absorbance Capability – units per ounce). Antioxidants have been proven as an effective weapon against free radicals.