Wolfberries (Lycium barbarum) have been used for over 5,000 years in China (called Goji berries in China). There are over 80 species of Lycium berries worldwide and 17 different species of wolfberries alone but there is only one Ningxia wolfberry. The Yellow River on the West Elbow Plateau, known for its fertile silt deposits, delivers minerals and nutrition to the pristine environment of the Ningxia province. This, in addition to plenty of sunlight and just the right temperature difference, has earned this area the title of "herbal medicine valley". There are 400% more centenarians (people age 100+) living in the Ningxia province than the rest of China. Chinese Olympic athletes considered the wolfberries (Goji berries) to be their "secret weapon" for endurance and stamina. The wolfberries from the Ningxia province are so treasured that there is a two week celebration in China for this most nutrient dense food on the planet. Wolfberries were the peasants' "ginseng" because they could harvest the wolfberries freely and could not afford the ginseng root.