Folium Ginkgo or ginkgo leaf was rarely recorded in ancient books on materia medica. It was not until 1960s that researchers at home and abroad began to discover its medicinal action, while screening and developing natural drugs.  Ginkgo leaf has been listed in the Pharmacopoeia of the People’s Republic of China (2005 Edition).  Its major active principles are lactone and flavone.  Modern researches prove that lactone can inhibit platelet aggregation to antagonize thrombosis, dilate blood vessels and promote blood flow, increase the volume of blood flow of the coronary arteries and ischemic heart regions, decrease myocardic oxygen consumption, improve cerebral circulation, nutrition and memory, accelerate brain cell metabolism, and protect neurons and brain tissues from ischemia and hypoxia injury.  Meanwhile, flavone is antioxidant, and can eliminate oxygen free radicals, prolong cell survival and delay aging of cerebral and heart blood vessels. For these reasons ginkgo leaf extracts are made into different preparations like tablets, oral liquid, capsules and injections.  It is used in the treatment of cerebrocardiovascular diseases, senile dementia, health care and aging prevention.