Corneliu Giurgea was a Romanian scientist that studied the brain and the aging of the brain over the years. In 1972 he came up with the concept of Nootropics. These are substances that:
They should enhance learning and memory.
They should enhance the resistance of learned behaviors/memories to conditions that tend to disrupt them
They should protect the brain against various physical or chemical injuries
They should increase the efficacy of the tonic cortical/subcortical control mechanisms.
They should lack the usual pharmacology of other psychotropic drugs (e.g. sedation, motor stimulation) and possess very few& side effects and extremely low toxicity.
Well, you came to the right place at Harney & Sons Fine Teas. Tea has always had a good reputation for helping the brain function better. It is that low dosage of the amino acid l-theanine and caffeine that stimulate and relax the brain.
Matcha teas have the highest levels of both of those naturally-occurring substances.
Also, there are several herbals that have developed a reputation for assisting with the gray matter between your ears.