Goji, goji berry, or wolfberry (Chinese: 枸杞; pinyin: gǒuqǐ), 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 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, Vietnamese, and Japanese medicine, since at least the 3rd century CE. The plant parts are called by the Latin names lycii fructus (fruit), herba lycii (leaves), etc., in modern official pharmacopeias.