Goji extract is a liquid substance that has been derived from goji berries, the fruit of the lycium plant. This plant is also known as wolfberry, Chinese boxthorn, and matrimony vine.In most instances, goji extract is taken only from the berries, though leaves are sometimes added to this type of extract. Throughout the world, goji has been used to treat various ailments ranging from burns to nosebleeds. Drinks made from goji extract are also popular throughout the world. Manufacturers of these drinks frequently claim that the goji fruit has cancer healing abilities, though this has yet to be proven.