"Brain Boosters" by Beverly Potter and Sebastian Orfali, is a 1993 book that talks about loads of drugs and nutrients that enhance the brain and nerves. One of the drugs is 'Centrophenoxine' which cleans out waste materials from brain and nerve cells.The drugs in this book are mostly rejected by the FDA, and prohibited for sale in the US. But they are used in Europe and Asia. You can often get generic forms from China and Mexico. Do searches for brain and nerve drugs and nutrients for a bunch of books that talk about all kinds of good chemicals that are being denied us in the USA. A simple on is niacin (vitamin B3), which can reverse senility in older people, if taken in amounts like 1000 to 3000 milligrams a day.