Why are Goji Berries classified as a superfood?

Nutrient-dense Goji Berries contain lots of carotenoids- beta-carotene, zeaxanthin, lutein, β-crytoxanthin, and lycopene, at least 6 vitamins (C, B1,B2,B3,B6,E), over 30 essential and trace elements (which is unheard of in any fruit), polyphenolic antioxidants and 19 amino acids.