2. The quality of Lycium barbarum is very particular about the place of origin. The growth environment and sunshine are different. The content of Lycium barbarum polysaccharide is different, and the nutritional value is also different. Although Lycium barbarum is produced in Shaanxi, Gansu, Ningxia, Qinghai and Xinjiang provinces, the Lycium barbarum produced in Ningxia and Gansu is the best. The Lycium barbarum in these two places is uniform in color, full in particles, moderate in size and adequate in light, moisture and temperature.