Omega 3s as well as the human brain are closely interlinked. You see, the human brain comprises of about 60 % fats. Out of these sixty % aproximatelly 50 % is comprised of DHA, that is one of two fatty acids that the body of ours needs.
The human body can't produce EPA and DHA, which are found in fish oils abundantly. This is why industry experts as well as researchers all over the world are recommending that pre workout supplement for weight loss (this website) with a high quality, ultra refined omega 3 fish oil.
You might get the omega-3 of yours from oily fish, but that poses the problem of heavy metal poisoning and contamination. A lot of fish these days 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 genuine energy source and molecularly distilled to confirm pharmaceutical grade purity, they are much safer to consume than fatty fish.
Many companies however make use of the whole fish in the pressing procedure. Meaning they utilize the liver of the fish, and that is loaded with contaminants which then find the way of theirs into the omega 3 nutritional supplements.
This's why you want to make certain that the companies are using a company that knows what they are doing. Many organizations will save on costs, which leads to sub standard products.
The good news is they're easily avoidable whenever you learn what to look for. I generally want to see clinical trials and independent reviews done on the products I am about to buy. I should see evidence of the effectiveness.

A recent medical trial found out that a new blend of hoki as well as tuna oil in similar device increases the benefits by up to two 1/2 times when compared to other omega 3 nutritional supplements sold these days.