Ginkgo biloba is said to increase blood flow in the brain to improve memory, and help prevent the formation of blood clots. It is also good for dealing with stress, Gingko has been used against the symptoms of Alzheimer's, circulatory disorders, dizziness, and stroke. Gotu Kola (Centella asiatica) is used as an aid for many memory problems, such as daily use to increase potential memory in school or at work, or for more severe problems such as senility when old age sets in.