For the most part, many of them are actually very effective, but the websites are either shady or straight up a complete scam. CogniFocus
Being aware of all of the different little important details of these websites and finding out as much as possible about the supplement itself is essential to selecting the ideal product for you and avoiding the numerous scams out there.
http://www.health350.com/cognifocus/
I have gathered all available information on this product from the official website as well as numerous 3rd party websites in order to help you make a wiser decision.
Yes, you can actually achieve what brain supplements offer by changing your diet, rather drastically, or you can take a supplement and feed your brain with the essential nutrients and vitamins it needs.