In most cases, Ginkgo biloba extract is sold as memory enhancer, and is used therapeutically for the symptomatic treatment of mild to moderate age-associated memory impairment and dementia (includes primary degenerative dementia, vascular (multi-infarct) dementia, as well as Alzheimer’s disease. There are also other uses of Ginkgo biloba extract (http://www.guidechem.com/cas-900/90045-36-6.html) which were found to be beneficial for treatment of inner ear disorders, such as acoustic trauma, hearing loss, tinnitus, and vertigo of vascular and involutive origin. Some scientific results also found that Ginkgo biloba leaf extract may also be beneficial for the treatment of early diabetic retinopathy and senile macular degeneration.
Ginkgo biloba extract is thought to have nootropic properties, and is mostly used as memory and concentration booster. However, studies vary about its effectiveness. According to some researches, ginkgo can considerably enhance attention in healthy people.