Known side effects with improper dosage are nausea, dizziness and headaches, but it is otherwise considered non-toxic. This is considered to be the oldest tree on earth. The leaf extract from this tree has been used for centuries to increase blood circulation to the tiny blood vessels of the brain. This results in improved memory, cognition and alertness. It is widely prescribed by doctors in Europe and Asia.
Effects are usually noticeable after two or three weeks of continue use.
There are no reported side-effects in the medical literature but some have experience stomach troubles in high doses. You can obtain this from most health food suppliers. This is just a small sketch of what it available for proper brain nutrition and improved creative thought. Hopefully, it will lead you to do your own research into what is available for enhanced brain functioning. Doing a keyword search on any of the amino acids or the four substances I've named, will bring you a wealth of detailed information and avenues to obtain these substances.