DMAE (Dimethylaminoethanol) is naturally found in and makes up bits of what is known the be the 'good' parts of oily fish.
The ingredients in DMAE are precursors to choline, and in turn acetylcholine (ACh), which is that vital neurotransmitter in the brain and part of both the peripheral and central nervous systems. ACh is what fuels our thoughts and helps with normal nerve functions around the body.
It is a popular choice, because not only does it positively affect choline in the body by way of replenishment, but it has also shown, through various clinical trials, to improve concentration and focus in users - be it for academic or endurance purposes.
The clinical trials related to choline suggest that increasing the amount of choline in the body, has a positive effect on both the body and mind. Furthermore, researchers are finding uses for DMAE for those who suffer with ADHD and Alzheimer's disease, where choline has a positive effect on minimizing some of the effects of these diseases. The anti-aging community and market is also taking a positive approach to DMAE, as it is becoming increasingly popular in certain anti-aging such as skin creams.
Most regular nootropics users will know that choline plays an important role in the fundamentals of a good nootropic stack, and DMAE fits that role perfectly.
A side benefit attributed to DMAE is that users report a very mild stimulatory effect after continued use for over 3 weeks.