I have been drinking a tea I found at my local asian market called Ginkgo and Green Tea. Has Ginkgo Biloba, Camellia Sinensis (green tea - Decaf) , American Ginseng (Panax Quiquefolius), and Asian Ginseng (Panax Ginseng). It claims to support mental alertness, memory, immune system, and vitality. It does seem to keep my energy levels up through out the day. I do not notice much of a difference in my memory. I like to have a cup in the morning to help me wake up.