Brain Plus IQ In practical conditions, this seems to translate into improvements in operating memory keep in mind and reaction periods (ref). -Learn More About Nootropics From Our Ingredient Guide- However, we don’t know how much Ginkgo biloba is in each pills. Research attesting to the efficacy of Ginkgo biloba as a nootropic have used a variety of doses, with anywhere from 120mg to 240mg and above being used on a consistent basis.