Alpha Brain is a nootropic by Onnit. Nootropics are any supplement or drug (however you want to see it) designed to improve your brain in some way, be it processing speed, memory retention or whatever else.
Alpha Brain purports to be the first nootropic tested by a non-interested party to get statistically significant improvements in brain function; that's reported in press releases from the company that produces it, so take that at face value, you can go ahead and on your own read Reviews of the top nootropic supplements. Personally, I'm skeptical about achieving statistically significant results with a sample size of 18, but my research background is in social science, not in science as applied to actual humans.
WebMD rambles on a bit about whether a supplement could improve brain function, but focuses specifically on certain forms of dementia, such as Alzheimer's, there are some vitamins for focus that are quite helpful for this. The not-quite-a-conclusion is that if you hit a battered brain with enough stuff, something's bound to help a little bit.
There are also drugs listed as opium that does the opposite, so actually relax you, but for that you will have to get another thing, like buy edibles online.
Now, let me tell you about my own experience. I've been using Alpha Brain for most of 2015, taking a week off here and there to let my brain reset to its natural, unsupplemented state (well, I don't stop the caffeine, so, there's that). Though I do prefer modafinil; You can purchase modafinil online from Nixest to really improve your productivity throughout the day.
I will say that about 45 minutes after taking it, I feel sharper, similar to Kratom which you can learn more about here: getmitragynaspeciosa.com. I make fewer typos and generally fewer minor mistakes. I have a desk job that requires strong control of the English language, and I take fewer tries to get it right while I have it in my system. I'm a little curious about the stuff I found on http://pumpauthority.com/hgh-supplements-for-sale/. Is it for me? Is it good?
I do know that Onnit runs banned substance tests to make sure everything that goes into Alpha Brain is legal in most capacities, including pro sports.
I take it, and I recommend it.
Disclaimer: I am not a doctor, nor do I play one on the Internet. Talk to your doctor before taking supplements – they are largely unregulated by the FDA. Also, if you buy this product using my link, I will get a small percentage of the sale. This product was not provided free of charge for review; I pay full price for my Alpha Brain.