Fish oil pills have a positive effect on the brain and the body. Recent studies by the American Heart Association state that it can maintain proper brain functioning and lower risks to the heart that lead to heart attacks. It seems as though our mothers had wisdom when then pulled out that cod liver oil and forced you to choke it down next to the sink.
They recommend eating fish three times a week to obtain enough Omega-3 fatty acids. The best way to consume such oils is through natural consumption. For some it may not be possible to get this much so it is beneficial to purchase fish oil pills. These can be taken 2 to 3 X a day throughout the entire week. The biggest issue you must worry about is to find mercury free products.
There is also an issue with cost. Fish oil supplements are much cheaper than buying fresh fish and cooking it. Fresh fish take a lot of preparation to do well and for some this may not be an option. In general, most pharmacies and grocery stores now offer fish oil supplements that will last a number of weeks for the price of a single fish meal. The best part is they can be stored in pill form and do not go rancid easily.