Briefly here are some other substances that are also clinically proven and worthy of mention, they include Adrafinil: www.antiaging-systems.com/27-adrafinil-olmifon , NADH: www.antiaging-systems.com/111-nadh amongst others. In conclusion we urge you not overlook the potential of Nootropics: www.antiaging-systems.com/articles/144-nootropics-put-your-brain-into-overdrive