Ginkgo –  Ginkgo biloba

Country of origin: China

The use of the Ginkgo Leaf is recent. Native to China, this tree is a unique species with no close relatives.  It is widely cultivated. The unique substances of the tree can support cognitive function.

reference: http://www.ncbi.nlm.nih.gov/pubmed/25446810 , http://www.ncbi.nlm.nih.gov/pubmed/22562327