Goji (Lycium barbarum) is a woody perennial plant which grows in the sheltered valleys of the Himalayas in Tibet, and in China and Mongolia. The berry of the Goji plant (also known as "Chinese Wolfberry") has long been used for medicinal purposes in traditional Chinese medicine to treat high blood pressure, diabetes, poor eyesight, vertigo, lumbago, impotence and menopausal complaints.
In recent years, Goji juice has become a popular nutritional supplement in the West. Goji is nutritionally rich, containing beta-carotene, Vitamins C, B1, B2 and other vitamins, minerals, antioxidants, and amino acids. Companies marketing the berries also claim the berries contain such nutrients as isoleucine, tryptophan, zinc, iron, copper, calcium, germanium, selenium, phosphorus, B6, and vitamin E.
As a supplement, Goji is available as a raw berries, juice, and as capsules.
"A few small clinical trials suggest that specific antioxidants from diet or vitamin supplements might improve asthma control or lung function in asthmatic children or adults."
Some studies have found that oxygen free radicals have a causal role in auto-immune diseases, such as rheumatoid arthritis (RA).
However, a report by the Harvard School of Public Health, found that "Randomized, placebo-controlled trials—which, when performed well, provide the strongest evidence—offer little support that taking vitamin C, vitamin E, beta-carotene, or other single antioxidants provides substantial protection against heart disease, cancer, or other chronic conditions. The results of the largest such trials have been mostly negative."