DMAE, or dimethylaminoethanol, is a compound found in high levels in anchovies and sardines. Small amounts of DMAE are also naturally produced in the human brain. Health-food outlets sell it in capsule form to “boost brain power.” While it probably won’t make you smarter, DMAE may play a role in treating memory lapses and symptoms of Alzheimer’s disease. Some evidence suggests it may also play a beneficial role against the impulsive and disruptive behaviors caused by attention deficit hyperactivity disorder (ADHD).