Omega 3s and the human brain are strongly interlinked. You see, the human brain is made up of aproximatelly 60 % fats. Out of these 60 % aproximatelly 50 % is comprised of DHA, which happens to be one of two fatty acids that our body needs.
The human body can't produce DHA and EPA, which are discovered in fish oils abundantly. This is the reason why experts and researchers all around the world are promoting that supplement with a top notch, ultra refined omega-3 fish oil.
You could get your omega-3 from fatty fish, but that poses the problem of heavy metal poisoning and contamination. A lot of fish nowadays are swimming in unclean waters. You might wonder, does not which make the supplements bad too?
Not necessarily, once the fish are caught from a pure source and molecularly distilled to be certain of pharmaceutical grade purity, they are much safer to ingest than fatty fish.
Many companies however make use of the entire fish in the pressing process. Meaning they use the liver of the fish, which is loaded with contaminants that then find the way of theirs into the omega 3 dietary supplements.
This's why you would like to ensure that the companies are using a brand name that knows what they are doing. Many businesses will save on costs, which leads to poor products.
The nice thing is that they're easily avoidable while you learn what to look exipure for sale on Amazon. I generally want to see clinical trials and independent reviews done on the products I am about to buy. I want to see evidence of the effectiveness.

A current clinical trial discovered that a brand new combination of hoki and tuna oil in similar device increases the advantages by as much as two 1/2 times when compared to other omega-3 nutritional supplements on the market nowadays.