Panax Ginseng and Ginkgo Biloba are two herbs that can improve cognitive function. A few studies' "evidence suggests that there are responders and non-responders" to the herbs (Canter and Ernst, 2003). But most studies demonstrate significant cognitive improvements for all subjects. Ginkgo and Ginseng can improve mood and lessen stress (Kennedy, Scholey, and Wesnes, 2002; Rai et al., 2003). As herbs see possible interactions for Ginkgo and Ginseng.