Ginkgo biloba, also known as the maidenhair tree, is a species of gymnosperm tree native to East Asia. It is the last living species in the order Ginkgoales, which first appeared over 290 million years ago. The tree has a unique fan-shaped leaf with a distinctive bilobed shape, and its leaves and seeds are

often used in traditional Chinese medicine.

Ginkgo biloba is commonly used as a dietary supplement to improve cognitive function, memory, and blood flow. The recommended dose of ginkgo biloba supplements varies, but a common dose is 40 milligrams of the extract three times daily. Some studies have used higher doses, ranging from 120 milligrams to 240 milligrams daily, to improve cognitive function in healthy individuals.