Goji, goji berry, or wolfberry is the fruit of either Lycium barbarum or Lycium chinense, two closely related species of boxthorn in the nightshade family, Solanaceae. L. barbarum and L. chinense fruits are similar but can be distinguished by differences in taste and sugar content.
Both of these species are native to Asia and have been long used in traditional Asian cuisine.
The fruit has also been an ingredient in traditional Chinese, Korean, and Japanese medicine since at least the 3rd century AD. In pharmacopeias, the fruit of the plant is called by the Latin name lycii fructus and the leaves are called herba lycii.
Since about 2000, goji berry and derived products have become common in developed countries as health foods or alternative medicine remedies, extending from exaggerated and unproven claims about their health benefits.